Definitions for "Preclude"
To put a barrier before; hence, to shut out; to hinder; to stop; to impede.
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.
keep from happening or arising; have the effect of preventing; "My sense of tact forbids an honest answer"
To prevent or stop.
make impossible, especially beforehand
As in "precludes credit for Anthropology 301." A preclusion indicates you will not receive credit if you take the precluded course later.