Preclude is defined as to prevent something from happening or to prevent someone from doing something.(verb)
An example of preclude is when you take someone's keys away so that they cannot drive.
See preclude in Webster's New World College Dictionary
See preclude in American Heritage Dictionary 4
transitive verb pre·clud·ed, pre·clud·ing, pre·cludes
Origin: Latin praeclūdere
Origin: : prae-, pre-
Origin: + claudere, to close.
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