a Side by side, facing forward. (defdate|First attested from around (1350 to 1470.))(reference-book | last =| first = | authorlink = | coauthors = | editor =Brown, Lesley | others = | title = The Shorter Oxford English Dictionary | origdate = | origyear = 1933| origmonth = | url = | format = | accessdate = | accessyear = | accessmonth = | edition = 5th | date = | year =2003| month = | publisher =Oxford University Press | location =Oxford, UK | language = | id = | doi = | isbn =978-0-19-860575-7 | lccn = | ol = | pages =8| chapter = | chapterurl = | quote =)
a (figurative) Alongside; parallel to. (defdate|First attested in the mid 17th century.)
a Informed, well-informed, familiar, acquainted. (defdate|First attested in the mid 17th century.)
a Up to a certain level or line; equally advanced; as, to keep 'abreast' of [or with] the present state of science. (defdate|First attested in the mid 17th century.)
a (context|nautical) Side by side; also, opposite; over against; on a line with the vessel's beam. (defdate|First attested in the late 17th century.)
a Side by side, facing forward. (defdate|First attested from around (1350 to 1470.))(reference-book | last =| first = | authorlink = | coauthors = | editor =Brown, Lesley | others = | title = The Shorter Oxford English Dictionary | origdate = | origyear = 1933| origmonth = | url = | format = | accessdate = | accessyear = | accessmonth = | edition = 5th | date = | year =2003| month = | publisher =Oxford University Press | location =Oxford, UK | language = | id = | doi = | isbn =978-0-19-860575-7 | lccn = | ol = | pages =8| chapter = | chapterurl = | quote =)
a (figurative) Alongside; parallel to. (defdate|First attested in the mid 17th century.)
a Informed, well-informed, familiar, acquainted. (defdate|First attested in the mid 17th century.)
a Up to a certain level or line; equally advanced; as, to keep 'abreast' of [or with] the present state of science. (defdate|First attested in the mid 17th century.)
a (context|nautical) Side by side; also, opposite; over against; on a line with the vessel's beam. (defdate|First attested in the late 17th century.)
p Abreast of; alongside.(reference-book | last =| first = | authorlink = | coauthors = | editor =Gove, Philip Babcock | others = | title = Webster's Third International Dictionary of the English Language Unabridged | origdate = | origyear = 1909 | origmonth = | url = | format = | accessdate = | accessyear = | accessmonth = | edition = | date = | year =1976 | month = | publisher =G. & C. Merriam Co. | location = Springfield, MA | language = | id = | doi = | isbn =0-87779-101-5 | lccn = | ol = | pages =5| chapter = | chapterurl = | quote =)