Definition of overture

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o·ver·ture    (vr-chr) KEY 

NOUN:

1. Music
   1. An instrumental composition intended especially as an introduction to an extended work, such as an opera or oratorio.
   2. A similar orchestral work intended for independent concert performance.
2. An introductory section or part, as of a poem; a prelude.
3. An act, offer, or proposal that indicates readiness to undertake a course of action or open a relationship.

TRANSITIVE VERB:
o·ver·tured, o·ver·tur·ing, o·ver·tures

1. To present as an introduction or proposal.
2. To present or make an offer or proposal to.

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ETYMOLOGY:
Middle English, opening, from Old French, from Vulgar Latin *pertra, alteration (influenced by Latin cperre, to cover), of Latin apertra from apertus, past participle of aperre, to open; see wer-⁴ in Indo-European roots