adverb
Side by side and facing forward.
(figurative) Alongside; parallel to.
Informed, well-informed, familiar, acquainted.
Followed by of or with: up to a certain level or line; equally advanced.
(Scotland) Breast high (of an advancing wave).
(nautical) Side by side; also, opposite; on a line with the vessel's beam.
(obsolete) At the same time; simultaneously.
adjective
Side by side, facing forward.
(figurative) Alongside; parallel to.
Informed, well-informed, familiar, acquainted.
Up to a certain level or line; equally advanced
(nautical) Side by side; also, opposite; over against; on a line with the vessel's beam.
preposition
Abreast of; alongside.