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[address] See: [PUBLIC-ADDRESS SYSTEM].
[Adminisphere] The rarified organizational layers above the rank and file that […]
[advance] See: [IN ADVANCE] or [IN ADVANCE OF].
[advantage] See: [TAKE ADVANTAGE OF], [TO ADVANTAGE].
[AFAIC] "as far as I'm concerned", or "as far as I […]
[AFAICS] "as far as I can see"
[AFAICT] "as far as I can tell"
[AFAIK] "as far as I know"
[AFAIR] "as far as I recall", or "as far as I […]
[AFC, AFK] "away from computer/keyboard"