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timespan

[tahym-span]
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noun
  1. a span of time; time frame.
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Origin of timespan

First recorded in 1930–35; time + span1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for timespans

timespan

n.

1933, from time (n.) + span (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper