preclude

to prevent or make impossible

Roots

clud / clus: close, shut, block
pre-: before, earlier, or in front

Other words with the clud / clus root

close: to shut or bring together
conclusive: settling an issue decisively
exclude: to shut out or leave out
include: to take in as part of a whole
occlude: to block or close up
recluse: socially withdrawn person

Preclude is closing the door before something can happen.

One missing prerequisite can preclude admission to the advanced seminar.

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