Webster's Dictionary, 1913

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Equilateral adjective [ Latin aequilateralis ; aequus equal + latus , lateris , side: confer French équilatéral .] Having all the sides equal; as, an equilateral triangle; an equilateral polygon.

Equilateral hyperbola (Geom.) , one whose axes are equal. -- Equilateral shell (Zoology) , one in which a transverse line drawn through the apex of the umbo bisects the valve, or divides it into two equal and symmetrical parts. -- Mutually equilateral , applied to two figures, when every side of the one has its equal among the sides of the other.

Equilateral noun A side exactly corresponding, or equal, to others; also, a figure of equal sides.

Equilibrate transitive verb [ imperfect & past participle Equilibrated ; present participle & verbal noun Equilibrating .] [ Latin aequilibratus in equilibrium; aequus equal + libra balance. See Equilibrium .] To balance two scales, sides, or ends; to keep even with equal weight on each side; to keep in equipoise. H. Spenser.

Equilibration noun
1. Act of keeping a balance, or state of being balanced; equipoise.

In . . . running, leaping, and dancing, nature's laws of equilibration are observed.
J. Denham.

2. (Biol.) The process by which animal and vegetable organisms preserve a physiological balance. H. Spenser.

Equilibrious adjective Evenly poised; balanced. Dr. H. More. -- E`qui*lib"ri*ous*ly , adverb

Equilibrist noun One who balances himself in unnatural positions and hazardous movements; a balancer.

When the equilibrist balances a rod upon his finger.
Stewart.

Equilibrity noun [ Latin aequilibritas equal distribution. See Equilibrium .] The state of being balanced; equality of weight. [ R.] J. Gregory.

Equilibrium noun ; plural English Equilibriums , Latin Equilibria . [ Latin aequilibrium , from aequilibris in equilibrium, level; aequus equal + libra balance. See Equal , and Librate .]
1. Equality of weight or force; an equipoise or a state of rest produced by the mutual counteraction of two or more forces.

2. A level position; a just poise or balance in respect to an object, so that it remains firm; equipoise; as, to preserve the equilibrium of the body.

Health consists in the equilibrium between those two powers.
Arbuthnot.

3. A balancing of the mind between motives or reasons, with consequent indecision and doubt.

Equilibrium valve (Steam Engine) , a balanced valve. See under Valve .

Equimomental adjective [ Equi- + momental .] (Mech.) Having equal moments of inertia.

» Two bodies or systems of bodies are said to be equimomental when their moments of inertia about all straight lines are equal each to each.

Equimomental cone of a given rigid body , a conical surface that has any given vertex, and is described by a straight line which moves in such manner that the moment of inertia of the given rigid body about the line is in all its positions the same.

Equimultiple adjective [ Equi- + multiple : confer French équimultiple .] Multiplied by the same number or quantity.

Equimultiple noun (Math.) One of the products arising from the multiplication of two or more quantities by the same number or quantity. Thus, seven times 2, or 14, and seven times 4, or 28, are equimultiples of 2 and 4.

Equinal adjective See Equine . "An equinal shape." Heywood.

Equine adjective [ Latin equinus , from equus horse; akin to Greek ..., Sanskrit a...va , Old Saxon ehu , Anglo-Saxon eh , eoh , Icelandic j...r , OIr. ech , confer Sanskrit a... to reach, overtake, perhaps akin to English acute , edge , eager , adjective Confer Hippopotamus .] Of, pertaining to, or resembling, a horse.

The shoulders, body, things, and mane are equine ; the head completely bovine.
Sir J. Barrow.

Equinia noun [ New Latin See Equine .] (Medicine) Glanders.

Equinoctial adjective [ Latin aequinoctials , from aequinoctium equinox: confer French équinoxial . See Equinox .]
1. Pertaining to an equinox, or the equinoxes, or to the time of equal day and night; as, the equinoctial line.

2. Pertaining to the regions or climate of the equinoctial line or equator; in or near that line; as, equinoctial heat; an equinoctial sun.

3. Pertaining to the time when the sun enters the equinoctial points; as, an equinoctial gale or storm, that is, one happening at or near the time of the equinox, in any part of the world.

Equinoctial colure (Astron.) , the meridian passing through the equinoctial points. -- Equinoctial line (Astron.) , the celestial equator; -- so called because when the sun is on it, the nights and days are of equal length in all parts of the world. See Equator .

Thrice the equinoctial line
He circled.
Milton.

-- Equinoctial points (Astron.) , the two points where the celestial and ecliptic intersect each other; the one being in the first point of Aries, the other in the first point of Libra. -- Equinoctial time (Astron.) reckoned in any year from the instant when the mean sun is at the mean vernal equinoctial point.

Equinoctial noun The equinoctial line.

Equinoctially adverb Towards the equinox.

Equinox noun [ Middle English equinoxium , equenoxium , Latin aequinoctium ; aequus equal + nox , noctis , night: confer French équinoxe . See Equal , and Night .]
1. The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox , Vernal equinox , under Autumnal and Vernal .

When descends on the Atlantic
The gigantic
Stormwind of the equinox .
Longfellow.

2. Equinoctial wind or storm. [ R.] Dryden.

Equinumerant adjective [ Equi- + Latin numerans , present participle of numerare to number.] Equal as to number. [ Obsolete] Arbuthnot.

Equip transitive verb [ imperfect & past participle Equipped ; present participle & verbal noun Equipping .] [ French équiper to supply, fit out, orig. said of a ship, Old French esquiper to embark; of German origin; confer Old High German scif , German schiff , Icelandic skip , Anglo-Saxon scip . See Ship .]
1. To furnish for service, or against a need or exigency; to fit out; to supply with whatever is necessary to efficient action in any way; to provide with arms or an armament, stores, munitions, rigging, etc.; -- said esp. of ships and of troops. Dryden.

Gave orders for equipping a considerable fleet.
Ludlow.

2. To dress up; to array; accouter.

The country are led astray in following the town, and equipped in a ridiculous habit, when they fancy themselves in the height of the mode.
Addison.

Equipage noun [ French équipage , from équiper . See Equip .]
1. Furniture or outfit, whether useful or ornamental; especially, the furniture and supplies of a vessel, fitting her for a voyage or for warlike purposes, or the furniture and necessaries of an army, a body of troops, or a single soldier, including whatever is necessary for efficient service; equipments; accouterments; habiliments; attire.

Did their exercises on horseback with noble equipage .
Evelyn.

First strip off all her equipage of Pride.
Pope.

2. Retinue; train; suite. Swift.

3. A carriage of state or of pleasure with all that accompanies it, as horses, liveried servants, etc., a showy turn-out.

The rumbling equipages of fashion . . . were unknown in the settlement of New Amsterdam.
W. Irving.

Equipaged adjective Furnished with equipage.

Well dressed, well bred.
Well equipaged , is ticket good enough.
Cowper.

Equiparable adjective [ Latin aequiparabilis .] Comparable. [ Obsolete or R.]

Equiparate transitive verb [ Latin aequiparatus , past participle of aequiparare .] To compare. [ R.]

Equipedal adjective [ Equi- + Latin pes , pedis , foot.] (Zoology) Equal- footed; having the pairs of feet equal.

Equipendency noun [ Equi- + pendency .] The act or condition of hanging in equipoise; not inclined or determined either way. South.

Equipensate transitive verb [ Equi- + pensatus , past participle of pensare to weigh. Confer Equipoise .] To weigh equally; to esteem alike. [ Obsolete]

Equipment noun [ Confer French équipement . See Equip .]
1. The act of equipping, or the state of being equipped, as for a voyage or expedition. Burke.

The equipment of the fleet was hastened by De Witt.
Hume.

2. Whatever is used in equipping; necessaries for an expedition or voyage; the collective designation for the articles comprising an outfit; equipage; as, a railroad equipment (locomotives, cars, etc. ; for carrying on business); horse equipments ; infantry equipments ; naval equipments ; laboratory equipments .

Armed and dight,
In the equipments of a knight.
Longfellow.

Equipoise noun [ Equi- + poise .]
1. Equality of weight or force; hence, equilibrium; a state in which the two ends or sides of a thing are balanced, and hence equal; state of being equally balanced; -- said of moral, political, or social interests or forces.

The means of preserving the equipoise and the tranquillity of the commonwealth.
Burke.

Our little lives are kept in equipoise
By opposite attractions and desires.
Longfellow.

2. Counterpoise.

The equipoise to the clergy being removed.
Buckle.

Equipollence, Equipollency noun [ Confer French équipollence . See Equipollent .]
1. Equality of power, force, signification, or application. Boyle.

2. (Logic) Sameness of signification of two or more propositions which differ in language.

Equipollent adjective [ Latin aequipollens ; aequus equal + pollens , - entis , present participle of pollere to be strong, able: confer French équipollent .]
1. Having equal power or force; equivalent. Bacon.

2. (Logic) Having equivalent signification and reach; expressing the same thing, but differently.

Equipollently adverb With equal power. Barrow.

Equiponderance, Equiponderancy noun [ Equi- + ponderance : confer French équipondérance .] Equality of weight; equipoise.

Equiponderant adjective [ Confer French équipondérant .] Being of the same weight.

A column of air . . . equiponderant to a column of quicksilver.
Locke.

Equiponderate intransitive verb [ Equi- + Latin ponderare to weigh. See Ponderate .] To be equal in weight; to weigh as much as another thing. Bp. Wilkins.

Equiponderate transitive verb To make equal in weight; to counterbalance. "More than equiponderated the declension in that direction." De Quincey.

Equiponderous adjective [ Equi- + Latin pondus , ponderis , weight.] Having equal weight. Bailey.

Equipondious adjective [ Latin aequipondium an equal weight; aequus equal + pondus weight.] Of equal weight on both sides; balanced. [ Obsolete] Glanvill.

Equipotential adjective [ Equi- + potential .] (Mech. & Physics) Having the same potential.

Equipotential surface , a surface for which the potential is for all points of the surface constant. Level surfaces on the earth are equipotential .

Equiradical adjective [ Equi- + radical .] Equally radical. [ R.] Coleridge.

Equirotal adjective [ Equi- + Latin rota wheel.] Having wheels of the same size or diameter; having equal rotation. [ R.]

Equisetaceous adjective (Botany) Belonging to the Equisetaceæ , or Horsetail family.

Equisetiform adjective [ Equisetum- + -form .] (Botany) Having the form of the equisetum.

Equisetum noun ; plural Equiseta . [ Latin , the horsetail, from equus horse + seta a thick,, stiff hair, bristle.] (Botany) A genus of vascular, cryptogamic, herbaceous plants; -- also called horsetails .

» The Equiseta have hollow jointed stems and no true leaves. The cuticle often contains siliceous granules, so that one species ( E. hyemale ) is used for scouring and polishing, under the name of Dutch rush or scouring rush .

Equisonance noun [ Equi- + Latin sonans , present participle of sonare to sound: confer F. équisonnance. See Sonant .] (Mus.) An equal sounding; the consonance of the unison and its octaves.

Equisonant adjective Of the same or like sound.

Equitable adjective [ French équitable , from équité . See Equity .]
1. Possessing or exhibiting equity; according to natural right or natural justice; marked by a due consideration for what is fair, unbiased, or impartial; just; as an equitable decision; an equitable distribution of an estate; equitable men.

No two . . . had exactly the same notion of what was equitable .
Macaulay.

2. (Law) That can be sustained or made available or effective in a court of equity, or upon principles of equity jurisprudence; as, an equitable estate; equitable assets, assignment, mortgage, etc. Abbott.

Syn. -- Just; fair; reasonable; right; honest; impartial; candid; upright.

Equitableness noun The quality of being equitable, just, or impartial; as, the equitableness of a judge, a decision, or distribution of property.

Equitably adverb In an equitable manner; justly; as, the laws should be equitably administered.

Equitancy noun [ Confer Late Latin equitantia . See Equitant .] Horsemanship.

Equitant adjective [ Latin equitans , -antis , present participle of equitare to ride, from eques horseman, from equus horse.]
1. Mounted on, or sitting upon, a horse; riding on horseback.

2. (Botany) Overlapping each other; -- said of leaves whose bases are folded so as to overlap and bestride the leaves within or above them, as in the iris.