The definition of choral is something associated with singing or something composed for or sung by a choir.(adjective)
A hymn that is composed in order to be sung by a church choir is an example of something that would be described as choral.
See choral in Webster's New World College Dictionary
See choral in American Heritage Dictionary 4
Origin: Medieval Latin chorālis
Origin: , from chorus, choral dance
Origin: , from Latin; see chorus.
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