mid-13c., paire, "a set of two, two of a kind coupled in use," from Old French paire "pair, couple," and directly from Medieval Latin paria "equals," neuter plural of Latin par (genitive paris) "a pair, counterpart, equal," noun use of par (adj.) "equal, equal-sized, well-matched" (see par (n.)).
Originally of things. Of persons from late 14c., "a couple, a sexual pair." Used from late 14c. with a plural noun to denote a single tool or device composed essentially of two pieces or parts (shears, tongs, spectacles, etc.). Meaning "a woman's breasts" is attested from 1922. Pair bond (v.) is first attested 1940, in reference to birds mating.
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<a href="https://www.etymonline.com/word/au pair">Etymology of au pair by etymonline</a>
Harper, D. (n.d.). Etymology of au pair. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/au pair
Harper Douglas, “Etymology of au pair,” Online Etymology Dictionary, accessed $(datetime), https://www.etymonline.com/word/au pair.
Harper, Douglas. “Etymology of au pair.” Online Etymology Dictionary, https://www.etymonline.com/word/au pair. Accessed $(datetimeMla).
D. Harper. “Etymology of au pair.” Online Etymology Dictionary. https://www.etymonline.com/word/au pair (accessed $(datetime)).
updated on March 01, 2017
Definitions of au pair from WordNet
au pair (n.)
a young foreigner who lives with a family in return for doing light housework;
From wordnet.princeton.edu, not affiliated with etymonline.