verb (used without object), respired, respiring.
to inhale and exhale air for the purpose of maintaining life; breathe.
to breathe freely again, after anxiety, trouble, etc.
verb (used with object), respired, respiring.
to breathe; inhale and exhale.
to exhale.

1375–1425; late Middle English respiren < Latin respīrāre, equivalent to re- re- + spīrāre to breathe; see spirit

prerespire, verb (used with object), prerespired, prerespiring.
unrespired, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
respire (rɪˈspaɪə)
1.  to inhale and exhale (air); breathe
2.  (intr) to undergo the process of respiration
3.  literary to breathe again in a relaxed or easy manner, as after stress or exertion
[C14: from Latin rēspīrāre to exhale, from re- + spīrāre to breathe; see spirit1]

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

late 14c., from O.Fr. respirer, from L. respirare "breathe again, breathe in and out," from re- "again" + spirare "to breathe" (see spirit).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

respire re·spire (rĭ-spīr')
v. re·spired, re·spir·ing, re·spires

  1. To breathe in and out; inhale and exhale.

  2. To undergo the metabolic process of respiration.

  3. To breathe easily again, as after a period of exertion.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The trait in amphibians is likely an adaptation to life between water and land
  and their ability to respire through the skin.
We were told that animals perspire and respire and plants transpire.
As the fish respire, their gills excrete ammonia into the water.
Microbial agents are used to naturally respire the selenium compounds selenate
  and selenite.
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