Campus

google

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late 18th century (originally US): from Latin campus ‘field’ (see camp1).

wiktionary

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Borrowed from Latin campus(“field”). Doublet of camp.

First used in its current sense in reference to Princeton University in the 1770s.

etymonline

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campus (n.)

"college grounds," 1774, from Latin campus "flat land, field," from Proto-Italic *kampo- "field," of uncertain origin. De Vaan finds cognates in Greek kampe "a bending, bow, curvature;" Lithuanian kampas "corner," kumpti "to bend," kumpas "curved;" Gothic hamfs "mutilated, lame," Old High German hamf, and concludes the source "could well be a European substratum word from agricultural terminology." First used in college sense at Princeton.