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Definition of duration : The state or quality of lasting; continuance in time; the portion of time during which anything exists.

Synonyms:

subsistence, chapter, life span, day, sequence, continuance, continuation, delay, durability, live, abidance, while, continuousness, distance, existence, endurance, succession, life, block, continuity, term, continuum, length, ceaselessness, standing, run, persistence, persistency, continue, countdown, stretch

lastingness, generation, lifetime, longevity, oldness, eon

forever, eternity, lapse

cycle, age, interim, epoch, measure, interval, spell, period, course, date, season, time, aeon, era, span

Usage examples:

• And we measure the amount of this human labor by its duration, by labor- time. - "Socialism: Positive and Negative", Robert Rives La Monte.
• At first, it is true, she felt some slight disappointment, or even pain, but these emotions were certainly of short duration. - "Bertha Garlan", Arthur Schnitzler.
• But this impression, if impression it were, was of short duration. - "The Mystery of the Hasty Arrow", Anna Katharine Green.