Dictionary

invade

verb in·vade \in-ˈvād\

: to enter (a place, such as a foreign country) in order to take control by military force

: to enter (a place) in large numbers

: to enter or be in (a place where you are not wanted)

in·vad·edin·vad·ing

Full Definition of INVADE

transitive verb
1
:  to enter for conquest or plunder
2
:  to encroach upon :  infringe
3
a :  to spread over or into as if invading :  permeate <doubts invade his mind>
b :  to affect injuriously and progressively <gangrene invades healthy tissue>
in·vad·er noun
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Origin of INVADE

Middle English, from Latin invadere, from in- + vadere to go — more at wade
First Known Use: 15th century

Synonym Discussion of INVADE

trespass, encroach, infringe, invade mean to make inroads upon the property, territory, or rights of another. trespass implies an unwarranted or unlawful intrusion <hunters trespassing on farmland>. encroach suggests gradual or stealthy entrance upon another's territory or usurpation of another's rights or possessions <the encroaching settlers displacing the native peoples>. infringe implies an encroachment clearly violating a right or prerogative <infringing a copyright>. invade implies a hostile and injurious entry into the territory or sphere of another <accused of invading their privacy>.
INVADE Defined for Kids

invade

verb in·vade \in-ˈvād\
in·vad·edin·vad·ing

Definition of INVADE for Kids

1
:  to enter by force to conquer or plunder
2
:  to show lack of respect for <She invaded their privacy.>
in·vad·er noun
Medical Dictionary

invade

transitive verb in·vade \in-ˈvād\
in·vad·edin·vad·ing

Medical Definition of INVADE

1
:  to enter and spread within either normally (as in development) or abnormally (as in infection) often with harmful effects <protect the body from invading viruses> <branches of a nerve invade the skin area>
2
:  to affect injuriously and progressively <gangrene invades healthy tissue>
in·vad·er \-ˈvād-ər\ noun

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