1640s, of spiders, "spinning a web," from Latin retiarius, from rete "a net" (see rete). From 1650s as "net-like."
In Roman history, a retiarius was a gladiator who wore only a short tunic and carried a trident and a net. "With these implements he endeavored to entangle and despatch his adversary, who was armed with helmet, shield, and sword." [Century Dictionary].
1660s, from un- (1) "not" + conditional (adj.). Related: Unconditionally. Unconditional surrender in the military sense is attested from 1730; in U.S., often associated with Civil War Gen. Ulysses S. Grant and the taking of Fort Donelson.
The ringing phrase of Grant's latest despatch circulated through the North like some coinage fresh from the mint, and "Unconditional Surrender," which suited the initials of his modest signature, became like a baptismal name. [James Schouler, "History of the United States of America," Dodd, Mead & Co., 1899].
We see in a telegraphic despatch from across the boundary line that a store was "burglarized" a short time ago. We are sorry that any thing so dreadful should have happened to any of our inventive cousins. Truly the American language is "fearfully and wonderfully made." [Upper Canada Law Journal, September 1865, p.228]
Burglarize, to, a term creeping into journalism. "The Yankeeisms donated, collided, and burglarized have been badly used up by an English magazine writer." (Southern Magazine, April, 1871.) The word has a dangerous rival in the shorter burgle. [Maximilian Schele De Vere, "Americanisms; The English of the New World," 1872]