invade

play
verb in·vade \ in-ˈvād \

Definition of invade

invaded; invading
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

invader

noun

Examples of invade in a Sentence

  1. The troops invaded at dawn.

  2. When tourists invade, the town is a very different place.

  3. The cancer eventually invaded the brain.

  4. Weeds had invaded the garden.

  5. Bacteria invaded and caused an infection.

Recent Examples of invade from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'invade.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of invade

Middle English, from Latin invadere, from in- + vadere to go — more at wade

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 English Language Learners

invade

play
verb

Definition of invade for English Language Learners

  • : 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)


INVADE Defined for Kids

invade

play
verb in·vade \ in-ˈvād \

Definition of invade for Students

invaded; invading
1 :to enter by force to conquer or plunder
2 :to show lack of respect for
  • She invaded their privacy.

invader

noun

Medical Dictionary

invade

play
transitive verb in·vade \ in-ˈvād \

medical Definition of invade

invaded; invading
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

invader

play \-ˈvād-ər\ noun

Law Dictionary

invade

transitive verb in·vade

legal Definition of invade

invaded; invading
1 :to encroach upon :infringe
  • invading a constitutional right
2 :to make payments out of (a fund from which payments are not ordinarily made)
  • authorized the trustee to invade the principal for educational expenses


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