Definitions
1.adjectiveSide by side, facing forward.
2.adjectiveAlongside; parallel to.
3.adjectiveInformed, well-informed, familiar, acquainted.
4.adjectiveUp to a certain level or line; equally advanced"to keep abreast of [or with] the present state of science."
5.adjectiveSide by side; also, opposite; over against; on a line with the vessel's beam.
6.adverbSide by side and facing forward.
7.adverbAlongside; parallel to.
8.adverbInformed, well-informed, familiar, acquainted.
9.adverbFollowed by of or with: up to a certain level or line; equally advanced."She believes it is important to keep abreast of new scientific developments."
10.adverbSide by side; also, opposite; on a line with the vessel's beam.
11.adverbAt the same time; simultaneously.
12.prepositionAbreast of; alongside."This ship sank abreast the island."