pl.n.
The forty most popular musical recordings or songs of a given time period.
adj.
Relating to, made up of, or broadcasting the Top 40: a Top 40 lineup; Top 40 radio stations.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
