Pronunciation: (u-brest'), [key]
1. side by side; beside each other in a line: They walked two abreast down the street.
2. equal to or alongside in progress, attainment, or awareness (usually fol. by of or with): to keep abreast of scientific developments; keeping abreast with the times.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.