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The Collaborative International Dictionary of English v.0.48 (gcide)

Preclude \Pre*clude"\, v. t. [imp. & p. p. {Precluded}; p. pr. &
vb. n. {Precluding}.] [L. praecludere, praeclusum; prae
before claudere to shut. See {Close}, v.]
1. To put a barrier before; hence, to shut out; to hinder; to
stop; to impede.
[1913 Webster]

The valves preclude the blood from entering the
veins. --E. Darwin.
[1913 Webster]

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.
[1913 Webster]

This much will obviate and preclude the objections.
--Bentley.
[1913 Webster]