Duration is how long something lasts, from beginning to end. A duration might be long, such as the duration of a lecture series, or short, as the duration of a party.

The noun duration has come to mean the length of time one thing takes to be completed. The duration of something might be known or not — in past times, the unknown length of time the current war would last was called "the duration. "Musical notes, such as whole notes, half notes, and quarter notes, have different set durations, or lengths of time for which they are held. These varying durations, when put together, create the rhythm of the music.

Definitions of duration
  1. noun
    the period of time during which something continues
    synonyms: continuance
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    the period from 1811-1820 when the Prince of Wales was regent during George III's periods of insanity
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    the time taken to traverse a measured course
    a period of dullness or boredom (especially in a work of literature or performing art)
    residence time
    the period of time spent in a particular place
    the complete duration of something
    stint, stretch
    an unbroken period of time during which you do something
    time scale
    an arrangement of events used as a measure of duration
    note value, time value, value
    (music) the relative duration of a musical note
    the duration of a monarch's or government's power
    attention span
    the length of time you can concentrate on some idea or activity
    extended time scale, slow time scale
    (simulation) the time scale used in data processing when the time-scale factor is greater than one
    fast time scale
    (simulation) the time scale used in data processing when the time-scale factor is less than one
    the period of time during which a regent governs
    type of:
    period, period of time, time period
    an amount of time
  2. noun
    the property of enduring or continuing in time
    synonyms: continuance
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    type of:
    the continuum of experience in which events pass from the future through the present to the past
  3. noun
    continuance in time
    “the ceremony was of short duration
    synonyms: length
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    duration as an extension
    continuation, lengthiness, prolongation, protraction
    the consequence of being lengthened in duration
    the property of being (or seeming to be) without end
    the property of being of short temporal extent
    brevity, briefness, transience
    the attribute of being brief or fleeting
    permanence, permanency
    the property of being able to exist for an indefinite duration
    impermanence, impermanency
    the property of not existing for indefinitely long durations
    length of service, longevity
    duration of service
    (music) a prolongation of unspecified length on a note or chord or rest
    ceaselessness, continuousness, incessancy, incessantness
    the quality of something that continues without end or interruption
    perpetuity, sempiternity
    the property of being perpetual (seemingly ceaseless)
    durability, enduringness, lastingness, strength
    permanence by virtue of the power to resist stress or force
    imperishability, imperishableness, imperishingness
    the property of being resistant to decay
    the property of being extremely durable
    the property of lasting only a short time
    transience, transiency, transitoriness
    an impermanence that suggests the inevitability of ending or dying
    the quality or state of being mortal
    the quality or state of being immortal
    the temporal property of being cut short
    the temporal property of being very short
    type of:
    temporal property
    a property relating to time
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