English Dictionary

Side by side, with breasts in a line; as, "Two men could hardly walk abreast.
Source : opted (542)  - auto

Side by side; also, opposite; over against; on a line with the vessel's beam; -- with of.
Source : opted (543)  - auto

Up to a certain level or line; equally advanced; as, to keep abreast of [or with] the present state of science.
Source : opted (544)  - auto

At the same time; simultaneously.
Source : opted (545)  - auto