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Top 40(tŏp′ fôr′tē)
The forty most popular musical recordings or songs of a given time period.
Relating to, made up of, or broadcasting the Top 40: a Top 40 lineup; Top 40 radio stations.
or Top′ For′ty,
1. the 40 most popular or best-selling recordings, songs, etc., within a stated time period.adj.
2. of, pertaining to, or being the Top 40.