Etymology
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Jill 
fem. proper name, Middle English Jille, Jylle, Gille, etc., familiar shortening of Jillian, Gillian, which represent the common Middle English pronunciation of Juliana (see Gillian). A very popular name for girls in medieval England, hence its use as a familiar, almost generic, name for a girl (early 15c.; paired with Jack since mid-15c.).
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Jane 
fem. proper name, from French Jeanne, Old French Jehane, from Medieval Latin Johanna (see John). As a generic name for "girl, girlfriend" it is attested from 1906 in U.S. slang. Never a top-10 list name for girls born in the U.S., it ranked in the top 50 from 1931 to 1956. It may owe its "everywoman" reputation rather to its association with the popular boy's name John.
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Parthenon (n.)

name of the temple of Athena Parthenos on the Acropolis in Athens, from Greek Parthenōn, literally "temple of the virgin goddess" (Athene), also, in a general sense, "the young women's apartments in a house," from parthenos "virgin, maiden, girl," a word of unknown origin. Beekes finds "acceptable" its derivation from IE *psteno- "breast" on the notion of "having protruding breasts." The temple was completed about 438 B.C.E., later served as a church and then a mosque under the Turks, and was shattered by an explosion of gunpowder stored there in 1687 during the Venetian siege.

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