1. (v. t.) To seize, and hold by force, or without right; as, to usurp a throne; to usurp power; to usurp the right of a patron is to oust or dispossess him.

2. (v. i.) To commit forcible seizure of place, power, functions, or the like, without right; to commit unjust encroachments; to be, or act as, a usurper.