overture (n.)

• advance
• approach
• bid
• breakthrough
• descant
• exordium
• feeler
• foreword
• frontispiece
• innovation
• introduction
• invitation
• leap
• offer
• offering
• postulate
• preamble
• preface
• prefix
• preliminary
• prelude
• premise
• presentation
• presupposition
• proffer
• prolegomenon
• prolepsis
• prologue
• proposal
• proposition
• submission
• tender
• vamp
• verse
• voluntary