(1):
A proposal; an offer; a proposition formally submitted for consideration, acceptance, or rejection.
(2):
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.
(3):
Disclosure; discovery; revelation.
(4):
(v. t.) To make an overture to; as, to overture a religious body on some subject.
(5):
An opening or aperture; a recess; a recess; a chamber.