An album of the most popular recordings in the repertoire of a band, singer, musical genre, etc.; now also used more generally of any of various types of compilations.
Origin
1950s; earliest use found in Life.
Definition of greatest hits in US English:
greatest hits
noun
An album of the most popular recordings in the repertoire of a band, singer, musical genre, etc.; now also used more generally of any of various types of compilations.