/ ˈɒpətjuːn; NAmE ˌɑːpərˈtuːn/ adjective ( formal )
1.
( of a time ) suitable for doing a particular thing, so that it is likely to be successful
SYN favourable :
The offer could not have come at a more opportune moment.
2.
( of an action or event ) done or happening at the right time to be successful :
an opportune remark
OPP inopportune
► op·por·tune·ly adverb
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WORD ORIGIN
late Middle English : from Old French opportun(e) , from Latin opportunus , from ob- in the direction of + portus harbour, originally describing the wind driving towards the harbour, hence seasonable.