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1. To put a barrier before; hence, to shut out; to hinder; to stop; to impede. The valves preclude the blood from entering the veins. (E. Darwin)

2. To shut out by anticipative action; to prevent or hinder by necessary consequence or implication; to deter action of, access to, employment of, etc.; to render ineffectual; to obviate by anticipation. This much will obviate and preclude the objections. (Bentley)

Origin: L. Praecludere, praeclusum; prae = before _ claudere to shut. See Close.