invade

UK: /ɪnˈveɪd/ US: /ɪnˈveɪd/ ,(in vād′)

Inflections of 'invade' (v): (⇒ conjugate)

invades

v 3rd person singular

invading

v pres p

invaded

v past

invaded

v past p

WordReference Random House Learner's Dictionary of American English © 2025

in•vade /ɪnˈveɪd/   v., -vad•ed, -vad•ing. 

1. to enter forcefully as an enemy;
   go into with hostile intent: [~ + object]
   The dictator invaded his neighboring states.
   [no object]
   He was ready to invade.
2. to enter and affect in a harmful or destructive way:
   [~ + object] viruses that invade the bloodstream.
3. to intrude upon;
   encroach or infringe on:
   [~ + object] to invade someone's privacy.
4. to enter or penetrate:
   [~ + object] City dwellers invaded the suburbs.

in•vad•er, n. [countable] See -vade-.

WordReference Random House Unabridged Dictionary of American English © 2025

in•vade  (in vād′), v., -vad•ed, -vad•ing. 
v.t. 

1. to enter forcefully as an enemy;
   go into with hostile intent:
   Germany invaded Poland in 1939.
2. to enter like an enemy:
   Locusts invaded the fields.
3. to enter as if to take possession:
   to invade a neighbor's home.
4. to enter and affect injuriously or destructively, as disease:
   viruses that invade the bloodstream.
5. to intrude upon:
   to invade the privacy of a family.
6. to encroach or infringe upon:
   to invade the rights of citizens.
7. to permeate:
   The smell of baking invades the house.
8. to penetrate;
   spread into or over:
   The population boom has caused city dwellers to invade the suburbs.

v.i. 

9. to make an invasion:
   troops awaiting the signal to invade.

• Latin invādere, equivalent. to in- in-² + vādere to go; see wade
• 1485–95

in•vad′a•ble, adj. 
in•vad′er, n. 
Synonyms

• 1, 2. penetrate, attack.

Collins Concise English Dictionary © HarperCollins Publishers::

invade / ɪnˈveɪd/ verb

1. to enter (a country, territory, etc) by military force
2. (transitive) to occupy in large numbers; overrun; infest
3. (transitive) to trespass or encroach upon (privacy, etc)
4. (transitive) to enter and spread throughout, esp harmfully; pervade

Etymology: 15th Century: from Latin invādere, from vādere to go

inˈvadable adjective

inˈvader noun