portable document format:
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.
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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