act
afterpiece
avant-propos
bit
breakthrough
chaser
curtain
curtain call
curtain raiser
divertimento
divertissement
epilogue
exode
exodus
exordium
expository scene
finale
foreword
front matter
frontispiece
hoke act
innovation
interlude
intermezzo
intermission
introduction
leap
number
overture
postulate
preamble
preface
prefix
prefixture
preliminary
prelude
premise
presupposition
proem
prolegomena
prolegomenon
prolepsis
protasis
routine
scene
shtick
sketch
skit
song and dance
prologed
prologing
prologs
prologued
prologues
prologuing
introd
rejoinder