/ ˈəʊvətʃʊə(r); -tjʊə(r); NAmE ˈoʊvərtʃər; -tʃʊr/ noun
1.
a piece of music written as an introduction to an opera or a ballet :
Prokofiev's overture to 'Romeo and Juliet'
2.
[ usually pl. ] overture (to sb) a suggestion or an action by which sb tries to make friends, start a business relationship, have discussions, etc. with sb else :
He began making overtures to a number of merchant banks.
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WORD ORIGIN
late Middle English (in the sense aperture ): from Old French , from Latin apertura aperture.