B.C.

from WordNet (r) 3.0 (2006)

B.C.
    adv 1: before the Christian era; used following dates before the
           supposed year Christ was born; "in 200 BC" [syn: {BC},
           {B.C.}, {before Christ}]

from The Collaborative International Dictionary of English v.0.48

BC \BC\, B C \B. C.\n.
   before Christ; used in reckoning dates before the supposed
   year Christ was born, i.e. 1 a. d..
   [WordNet 1.5]

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