Meaning

noun a wrongful interference with the possession of property (personal property as well as realty), or the action instituted to recover damages

noun entry to another's property without right or permission

verb enter unlawfully on someone's property

originFrom Middle English trespassen, borrowed from Old French trespasser (“to go across or over, transgress”), from tres- (“across, over”) + passer (“to pass”).

Etymology from Wiktionary, CC BY-SA 3.0