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c.1400, "not being executed, unfulfilled" (of legal matters), from Anglo-French suspens (in en suspens "in abeyance," c.1300), from Old French suspens "act of suspending," from Latin suspensus, past participle of suspendere (see suspend). Meaning "state of mental uncertainty" (mid-15c.) is from legal meaning of "not rendered, not paid, not carried out" (e.g. suspended sentence). As a genre of novels, stories, etc., attested from 1952.