"overture" in the noun sense
1. overture
orchestral music played at the beginning of an opera or oratorio
2. preliminary, overture, prelude
something that serves as a preceding event or introduces what follows
"training is a necessary preliminary to employment"
"drinks were the overture to dinner"
3. overture, advance, approach, feeler
a tentative suggestion designed to elicit the reactions of others
"she rejected his advances"
Source: WordNet® (An amazing lexical database of English)
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