1) Comte, par exemple 2) Concentration 3) French word used in English 4) Strength of a solution 5) Titer 1) Titer 
(Fr. titre standard) the quantity of a substance required to produce a reaction with a given volume of another substance, or the amount of one substance required to correspond with a given amount of another substance.
The measure of antibodies in the bloodstream. 
<chemistry> The quantity of a substance required to produce a reaction with a given volume of another substance or the amount of one substance required to correspond with a given amount of another substance. ... Origin: Fr. Titre = standard ... (13 Nov 1997) ... 
The reciprocal of the last dilution of a titration giving a measurable effect; e.g. if the last dilution giving significant agglutination is 1:128, the titre is 128.
The strength or quantity of a chemical substance in solution.
Titre: Variant spelling of 'titer' -- the degree of dilution of a substance such as an antibody, reflecting the strength of the solution. Americans spell it 'titer' while the English spell it 'titre,' French for 'title,' derived from the Latin 'titulus,' an inscription or label. The 'titre' was evidence of the fineness of an alloy of gold or silver...