Etymology
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perspiration (n.)

1610s, "a breathing through," a sense now obsolete, from French perspiration (1560s), noun of action from perspirer "perspire," from Latin perspirare "blow or breathe constantly," from per "through" (from PIE root *per- (1) "forward," hence "through") + spirare "to breathe, blow" (see spirit (n.)). Applied by 1620s to "excretion of invisible moistures through the skin," hence its later use as a euphemism for "sweat" (1725).

updated on April 15, 2020

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Definitions of perspiration from WordNet

perspiration (n.)
salty fluid secreted by sweat glands;
Synonyms: sweat / sudor
perspiration (n.)
the process of the sweat glands of the skin secreting a salty fluid;
perspiration is a homeostatic process
Synonyms: sweating / diaphoresis / sudation / hidrosis
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.