overture

overture is a   Noun

Definition:

[1] An opening or aperture; a recess; a recess; a chamber. [Obs.] Spenser. "The cave`s inmost overture." Chapman.

[2] Disclosure; discovery; revelation. [Obs.] It was he That made the overture of thy treasons to us. Shak.

[3] A proposal; an offer; a proposition formally submitted for consideration, acceptance, or rejection. "The great overture of the gospel." Barrow.

[4] A composition, for a full orchestra, designed as an introduction to an oratorio, opera, or ballet, or as an independent piece; -- called in the latter case a concert overture.

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