1. A robber on the high seas; one who by open violence takes the property of another on the high seas; especially, one who makes it his business to cruise for robbery or plunder; a freebooter on the seas; also, one who steals in a harbor.
Origin: L. Pirata, Gr, fr. To attempt, undertake, from making attempts or attacks on ships, an attempt, trial; akin to E. Peril: cf. F. Pirate. See Peril.