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KEY: Time.
SYN: Period, duration, season, interval, date, opportunity, age, era, occasion, term, space, span, spell.
ANT: Neverness, eternity, non-duration, indetermination, indeterminableness.
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KEY: Timely.
SYN: Early, seasonable, opportune, prompt, judicious.
ANT: Late, unseasonable, inopportune, injudicious, ill-timed, untimely.
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KEY: Timeserving.