Webster’s Revised Unabridged Dictionary · 1913
Prologue
Pro′logue (pro′lŏ; 277), n. [F., fr. L. prologus, fr. Gr. πρόλογος, fr. προλέγειν to say beforehand; πρό before + λέγειν 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. [R.] Shak.
Pro′logue, v. t. [imp. & p. p. Prologued; p. pr. & vb. n. Prologuing.] To introduce with a formal preface, or prologue. [R.] Shak.