a leg up, accidentality, actuarial calculation, adventitiousness, bout, break, casualness, chance, clear stage, destiny, fair field, fair game, fate, flukiness, fortuitousness, fortuity, fortune, gamble, go, good fortune, good luck, hap, happenstance, happy chance, heedless hap, hope, how they fall, indeterminacy, indeterminateness, inning, innings, juncture, law of averages, leisure, liberty, look-in, lot, luck, moira, moment, occasion, opening, opportunism, pass, place, possibility, prayer, principle of indeterminacy, probability, problematicness, random sample, relief, risk, room, round, run of luck, say, scope, serendipity, shot, show, space, spell, squeak, statistical probability, stepping-stone, the breaks, theory of probability, time, time at bat, turn, uncertainty, uncertainty principle, whack, whatever comes
timeliness, occasion, opportunity
, opening, room, event (eventuality), suitable season, proper season, suitable time, proper time, high time, opportuneness, tempestivity, crisis, turn, juncture, conjuncture, crisis, turning point, given time, nick of time, golden opportunity
, well timed opportunity
, fine opportunity
, favorable opportunity
, opening, clear stage, fair field, mollia tempora, fata Morgana, spare time, opportune, timely, well-timed, timeful, seasonable, providential, lucky, fortunate, happy, favorable, propitious, auspicious, critical, suitable, obiter dicta, opportunely, in proper course, in due course, in proper season, in due season, in proper time, in due time, for the nonce, in the nick of time, in the fullness of time, all in good time, just in time, at the eleventh hour, now or never, by the way, by the by, en passant, a propos, pro re nata, pro hac vice, par parenthese, parenthetically, by way of parenthesis, incidentally, while speaking of, while on the subject, extempore, on the spur of the moment, on the spur of the occasion, on the spot, carpe diem occasionem cognosce, one's hour is come, the time is up, that reminds me, now that you mention it, come to think of it, bien perdu bien connu, e sempre l'ora, ex quovis ligno non fit Mercurius, nosce tempus, nunc aut nunquam.