Etymology
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in loco parentis 
legal Latin, 1640s in English, literally "in the place of a parent," from loco, ablative of locus "a place" (see locus (n.)) + parentis, genitive of parens "parent" (see parent (n.)).
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loc. cit. 
abbreviation of Latin loco citato or locus citatus "in the place (already) cited;" hence, "in the book that has been previously quoted." See locus, cite. In use in English books by 1704.
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