
1) Entering 2) Entrance 3) Entry 4) French word used in English 5) Incoming 6) Ingress
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https://www.crosswordclues.com/clue/irruption

1) Ingress 2) Outbreak 3) Recrudescence
Found on
https://www.crosswordclues.com/clue/irruption

Sudden entrance of many birds of the same species into an area outside their typical range. (singular: vagrant)
Found on
http://earthdesign.ca/dict.html

breaking or bursting in
Found on
http://phrontistery.info/i.html

• (n.) A bursting in; a sudden, violent rushing into a place; as, irruptions of the sea. • (n.) A sudden and violent inroad, or entrance of invaders; as, the irruptions of the Goths into Italy.
Found on
http://thinkexist.com/dictionary/meaning/irruption/

Act or process of breaking through to a surface. ... Origin: L. Irruptio, fr. Irrumpo, to break in ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

Large-scale movement of a species outside its typical range, usually in autumn or winter; such movements do not occur in regular, predictable patterns, unlike migration.
Found on
http://www.encyclo.co.uk/local/22218

Mass movement of a population from one place to another.
Found on
http://www.encyclo.co.uk/local/22219

describes sporadic migration which occurs only in some years, usually due to lack of prey availability in typical range
Found on
http://www.encyclo.co.uk/local/22220
Ir·rup'tion noun [ Latin
irruptio : confer French
irruption . See
Irrupted .]
1. A bursting in; a sudden, violent rushing into a place; as,
irruptions of the sea. « Lest evil tidings, with too rude
irruption Hitting thy aged ear, should pierce too dee...
Found on
http://www.encyclo.co.uk/webster/I/100

Type: Term Pronunciation: i-rŭp′shŭn Definitions: 1. Act or process of breaking through to a surface.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=45754

(L: in=in; rumpere to break; forcible entry) a spontaneous migratory movement occasioned by an animal population suddenly increasing and outgrowing its food supply, thereby creating conditions that no longer support life.
Found on
http://www.seafriends.org.nz/books/glossary.htm

[
n] - a sudden violent entrance
Found on
http://www.webdictionary.co.uk/definition.php?query=irruption

irruption 1. A breaking or bursting in; a violent incursion or invasion. 2. A sudden violent spontaneous occurrence (usually of some undesirable condition). 3. In ecology, a sudden increase in an animal population. Related break, broken-word units: clast-; frag-.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1875/3

Mass movement of a population from one place to another
Found on
https://birds.iitk.ac.in/glossary?page=108

occurs when a large number of a species move to an area where they are not commonly found in large numbers, often in response to drought, rainfall or other environmental changes
Found on
https://sciencetrek.org/sciencetrek/topics/owls/glossary.cfm
noun a sudden violent entrance; a bursting in; `the recent irruption of bad manners`
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https://www.encyclo.co.uk/local/20974

an unusually large influx of birds to an area; often associated with winter finches and usually caused by a shortage of food elsewhere
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https://www.encyclo.co.uk/local/21787

A temporary influx into an area, usually brought about by more favourable conditions in that region, or unfavourable conditions in the species' usual range, e.g. following a drought. White-crested Helmetshrike, Lark-like Bunting and Harlequin Quail are good examples of irruptive species.
Found on
https://www.encyclo.co.uk/local/22222

a breaking or bursting in; a violent incursion or invasion. · a sudden increase in an animal population.
Found on
https://www.infoplease.com/dictionary/irruption

Extremes of heat, cold, drought, and food shortages can drive out large numbers of birds that then arrive in an area where they are rarely if ever seen. Conversely, flooding and insect and rodent plagues can attract an irruption of water birds and raptors respectively, for instance. Often leads to lifers, ticks, and megaticks.
Found on
https://www.sciencebase.com/science-blog/birding-glossary.html

a sudden violent entrance; a bursting in
Found on
https://www.vocabulary.com/lists/310894
No exact match found.