Legality

google

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late Middle English: from French légalité or medieval Latin legalitas ‘relating to the law’, from Latin legalis (see legal).

wiktionary

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legal +‎  -ity

etymonline

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legality (n.)

mid-15c., "law-abiding behavior or character," from Medieval Latin legalitatem (nominative legalitas), from Latin legalis "pertaining to the law" (see legal).