Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation per diem
  • abbreviation police department
  • abbreviation postal district
  • abbreviation potential difference
  • abbreviation public domain

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism law enforcement police department
  • initialism electronics Phase detector.
  • initialism Ireland Progressive Democrats, a political party.
  • initialism Public domain.
  • initialism peritoneal dialysis
  • abbreviation U.S. military : Period (full stop) punctuation mark, used in communication systems without punctuation (e.g., telegrams).

Etymologies

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