·adv At the same time; simultaneously.
II. Abreast ·adv Side by side, with breasts in a line; as, "Two men could hardly walk abreast.".
III. Abreast ·adv Side by side; also, opposite; over against; on a line with the vessel's beam;
— with of.
IV. Abreast ·adv Up to a certain level or line; equally advanced; as, to keep abreast of [or with] the present state of science.