I.D.

I.D.

3.
Military. Infantry Division.
4.
Intelligence Department.

Origin:
1950–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Abbreviations & Acronyms
i.d.
  1. inner diameter

  2. inside diameter

  3. internal diameter

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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