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The prefix 'im' means 'not'.

Confusion arises from the assimilation of this old definition of im-, into the present English definition meaning not. Il-, im- and ir- are all presently defined as auxiliary prefixes of in-.

  • il- is used for words beginning with L; illegal.

  • im- is used for words beginning with B, P or M; imbalance, impenetrable and immortal.

  • ir- is used for words beginning with R; irregular.

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Alicia Botsford

Lvl 10
3y ago

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