verb (used without object), elapsed, elapsing.
(of time) to slip or pass by: Thirty minutes elapsed before the performance began.
the passage or termination of a period of time; lapse.

1635–45; < Latin ēlapsus (past participle of ēlābī to slip away), equivalent to e- e-1 + lab- slip + -sus for -tus past participle suffix

unelapsed, adjective
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World English Dictionary
elapse (ɪˈlæps)
(intr) (of time) to pass by
[C17: from Latin ēlābī to slip away, from lābī to slip, glide]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1640s, from M.Fr. elapser, from L. elapsus, pp. of elabi "slip or glide away," from ex- "out, away" + labi "to slip, glide." The noun now corresponding to elapse is lapse. Related: Elapsed; elapsing.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In the case of products aged in wood, several years could elapse before they were shipped.
The amendment itself permits seven years to elapse before it dies, if unratified.
The test requires that five minutes elapse before any cooling or extinguishing
  agent can be applied to the brakes.
Often several years elapse before developers can obtain approval to begin
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