Etymology
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respire (v.)

late 14c., respiren, "breathe, draw breath," from Old French respirer (12c.) and directly from Latin respirare "breathe again, breathe in and out," from re- "again" (see re-) + spirare "to breathe" (see spirit (n.)). Formerly also "to rest or enjoy relief after toil or exertion" (1590s). Related: Respired; respiring.

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Definitions of respire

respire (v.)
breathe easily again, as after exertion or anxiety;
respire (v.)
undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide;
respire (v.)
draw air into, and expel out of, the lungs;
Synonyms: breathe / take a breath / suspire
From wordnet.princeton.edu