early 15c., "act of setting free from bondage," also "action of handing over to another," from Anglo-French delivrée, noun use of fem. past participle of Old French delivrer (see deliver). Sense of "childbirth, giving forth of offspring" is by 1570s; that of "manner of utterance or enunciation" is from 1660s. Of a blow, throw of a ball, etc., "act of sending or putting forth," from 1702. The hospital's childbirth delivery room is attested by 1849 (in early use often in a German context, translating Kreisszimmer).
"vehicle," 1610s, originally "small wheel" (especially one on which the carriages of a ship's guns were mounted), probably from Latin trochus "iron hoop," from Greek trokhos "wheel," from trekhein "to run" (see truckle (n.)). Sense extended to "cart for carrying heavy loads" (1774), then in American English to "motor vehicle for carrying heavy loads" (1913), a shortened form of motor truck in this sense (1901).
There have also been lost to the enemy 6,200 guns, 2,550 tanks and 70,000 trucks, which is the American name for lorries, and which, I understand, has been adopted by the combined staffs in North-West Africa in exchange for the use of the word petrol in place of gasolene. [Winston Churchill, address to joint session of U.S. Congress, May 19, 1943]
Truck stop is attested from 1956.