1. Adverb.  Informed, well-informed, familiar, acquainted.
  2. Adverb.  Side by side, facing forward, with breasts in a line; as,.
  3. Adverb.  (nautical) Side by side; also, opposite; over against; on a line with the vessel's beam; – with ''of''.
  4. Adverb.  Up to a certain level or line; equally advanced; as, to keep '''abreast''' of [or with] the present state of science.
  5. Adverb.  (obsolete) : At the same time; simultaneously.

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This entry was last updated on RefTopia from its source on 3/20/2012.