What do a.m. and p.m. stand for?


noun, plural PDFs for 2. Computers.
a file format that makes it possible to display text and graphics in the same fixed layout on any computer screen.
a document or file in this format.
Origin of PDF
P(ortable) D(ocument) F(ormat) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for PDF


portable document format: a format in which documents may be viewed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for PDF


by 1992, initialism for portable document format, a generic term.

Online Etymology Dictionary, © 2010 Douglas Harper
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PDF in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Related Abbreviations for PDF


  1. Parkinson's Disease Foundation
  2. portable document file
  3. precision direction finder
  4. programmable data formatter
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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