from The American Heritage® Dictionary of the English Language, 4th Edition

  • Variant of in-1.
  • Variant of in-2.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • A form of the prefix in-, used before b, m and p
  • Alternative form of the prefix em-, itself variant of en-.

from the GNU version of the Collaborative International Dictionary of English

  • A form of the prefix in- not, and in- in. See in-. Im- also occurs in composition with some words not of Latin origin.


Alternative form of in-, of various etymologies and meanings. (Wiktionary)
From em-, from Old French em-, and also from later Middle French im-, partly by confusion with im- of Latin origin. (Wiktionary)



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