Entirety

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Middle English: from Old French entierete, from Latin integritas, from integer ‘untouched, whole’ (see entire). Compare with integrity.

wiktionary

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From Middle English enterete, from Old French entiereté, from Latin integritās, from integer(“complete, whole”). Doublet of integrity.

etymonline

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entirety (n.)

"wholeness, completeness, state of being entire or whole," also entierty, mid-14c., enterete, intierty, from Anglo-French entiertie, Old French entiereté "totality, entirety; integrity, purity," from Latin integritatem (nominative integritas) "completeness, soundness, integrity," from integer (see integer).