American Dictionary

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Definition invasion in American English

invasion noun

[countable/uncountable] noun
/ɪnˈveɪʒ(ə)n/
1

an occasion when one country's army goes into another country to take control of it by force

Example

the Roman invasion of Britain under Julius Caesar

Example

an invasion force

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2

a situation in which a large number of people or things come to a place at the same time, especially in an annoying way

Example

The stores prepared for an invasion of last-minute Christmas shoppers.

Example

the annual summer invasion of tourists

Synonyms and related words
3

the movement of a disease or of the cells that cause it from one area to another

Example

an invasion of cancer cells

Synonyms and related words
Definition invasion in American English