Usually means: Microsecond, one millionth of a second.
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We found 5 dictionaries that define the word usec:

General (3 matching dictionaries)
  1. usec: Wordnik
  2. USEC: Dictionary.com
  3. Usec: Wiktionary

Miscellaneous (2 matching dictionaries)
  1. USEC: Acronym Finder
  2. AbbreviationZ (No longer online)

Definitions from Wiktionary (Usec)

noun:  (Philippines, government) Abbreviation of undersecretary. [An administrator immediately subordinate to a head of a government department or to a member of a cabinet]


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