Pro″logue (?), n. [F., fr. L. prologus, fr. Gr. �, fr. � to say beforehand; � before + � to say. See Logic.]
1. The preface or introduction to a discourse, poem, or performance; as, the prologue of Chaucer's “Canterbury Tales;” esp., a discourse or poem spoken before a dramatic performance
2. One who delivers a prologue. Shak.