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We are the world's largest and most comprehensive directory and search engine for acronyms, abbreviations and initialisms on the Internet. Abbreviations.com holds hundreds of thousands of entries organized by a large variety of categories from computing and the Web to governmental, medicine and business and it is maintained and expanded by a large community of passionate editors. Read more about our awards and press coverage.

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PMSO
Private Medical Students Organization
DEFS
Direct Applied Exterior Finishing System
DEFs
Data Exchange Formats
SEOC
Software Engineering with Objects and Components
TAI
Temps Atomique International (International Atomic Time) [to 2015 July 1st, 35s ahead of UTC; from 2015 July 1st, 36s ahead of UTC.]