Definition: duration

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Source: WordNet (r) 1.7 

duration
     n 1: the period of time during which something continues [syn: continuance]
     2: the property of enduring or continuing in time [syn: continuance]
     3: continuance in time; "the ceremony was of short duration";
        "he complained about the length of time required" [syn: length]

Source: Webster's Revised Unabridged Dictionary (1913) 

Duration \Du*ra"tion\, n. [OF. duration. See Dure.]
   The state or quality of lasting; continuance in time; the
   portion of time during which anything exists.

         It was proposed that the duration of Parliament should
         be limited.                              --Macaulay.

         Soon shall have passed our own human duration. --D.
                                                  Webster.