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par (n.)

1620s, "equality in value or circumstances," also "value of one currency in terms of another," from Latin par "equal, equal-sized, well-matched," also as a noun, "that which is equal, equality," a word of unknown and disputed origin. De Vaan is noncommittal. Watkins suggests perhaps from PIE root *pere- (2) "to grant, allot," with suggestion of reciprocality. Another guess connects it with PIE root *per- (5) "to traffic in, sell" (on notion of "give equal value for"). Meaning "a standard fixed by consent or by natural conditions, average or usual amount" is first attested 1767. Golf sense is attested by 1898, which led to the figurative use of par for the course for "fairly normal, what can be expected" (by 1928).

par (prep.)

"by, for," mid-13c., from Old French par, per, from Latin per (see per). It figures in some French phrases borrowed into English and in the formation of some words (parboil, pardon, parvenu). In some older borrowings from French it has been re-Latinized to per- (perceive, perfect, perform, pertain).

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Definitions of par from WordNet
1
par (n.)
(golf) the standard number of strokes set for each hole on a golf course, or for the entire course;
a par-5 hole
par for this course is 72
par (n.)
a state of being essentially equal or equivalent; equally balanced;
on a par with the best
2
par (v.)
make a score (on a hole) equal to par;
From wordnet.princeton.edu