Elopement

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late 16th century (in the general sense ‘abscond, run away’): from Anglo-Norman French aloper, perhaps related to leap.

wiktionary

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elope +‎  -ment

etymonline

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elopement (n.)

"a running away, an escape, private or unlicensed departure from the place or station to which one is bound by duty or law," especially "the running away of a woman, married or unmarried, with a lover," 1540s, from elope + -ment. (The word was in Anglo-French in 14c. as alopement).