tenure (n.)

early 15c., "holding of a tenement," from Anglo-French and Old French tenure "a tenure, estate in land" (13c.), from Old French tenir "to hold," from Vulgar Latin *tenire, from Latin tenere "to hold" (see tenet). The sense of "condition or fact of holding a status, position, or occupation" is first attested 1590s. Meaning "guaranteed tenure of office" (usually at a university or school) is recorded from 1957. Related: Tenured (1961).

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Definitions of tenure from WordNet
tenure (n.)
the term during which some position is held;
Synonyms: term of office / incumbency
tenure (n.)
the right to hold property; part of an ancient hierarchical system of holding lands;
Synonyms: land tenure
tenure (v.)
give life-time employment to;
She was tenured after she published her book