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I.D.

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  1. identification.
  2. identity.
  3. Military. Infantry Division.
  4. Intelligence Department.
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Origin of I.D.

First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for i.d.

I.D.

also ID (but pronounced as separate letters), short for identification, attested from 1955.

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Online Etymology Dictionary, © 2010 Douglas Harper