Transition

google

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late Middle English (in the sense ‘grammatical transitivity’): from Latin transitio(n- ), from transire ‘go across’.

wiktionary

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From Middle French transition, from Latin transitio.

etymonline

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transition (n.)

mid-15c., transicion, in grammar, from Latin transitionem (nominative transitio) "a going across or over," noun of action from past-participle stem of transire "go or cross over" (see transient).