Definition of overtures:
(n) :
(often in plural) An approach or proposal made to initiate communication, establish a relationship etc.
(n) :
(music) A musical introduction to a longer piece of music or a dramatic work (such as a play, an opera, or a motion picture).
(n) :
(music) A medley of themes from a larger work, such as an opera or musical, typically played at the beginning but sometimes played at any part of the work or performed as a standalone piece.
(v) :
(intransitive) To make overtures; to approach with a proposal.
(n) :
(Scotland) A motion placed before a legislative body, such as the General Assembly of the Church of Scotland.
(adj) :
(heraldry, nonstandard) Overt, that is, disclosed.