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ex·trin·sic / ikˈstrinzik; -sik/ • adj. not part of the essential nature of someone or something; coming or operating from outside: extrinsic factors that might affect time budgets. ∎  (of a muscle, such as any of the eye muscles) having its origin some distance from the part that it moves.DERIVATIVES: ex·trin·si·cal·ly / -(ə)lē/ adv.