'Motet' definitions:

Definition of 'motet'

From: WordNet
noun
An unaccompanied choral composition with sacred lyrics; intended to be sung as part of a church service; originated in the 13th century

Definition of 'Motet'

From: GCIDE
  • Motet \Mo*tet"\, n. [F., a dim. of mot word; cf. It. mottetto, dim. of motto word, device. See Mot, Motto.] (Mus.) A composition adapted to sacred words in the elaborate polyphonic church style; an anthem. [1913 Webster]