I. ˈja-kət noun
Etymology: Middle English jaket, from Anglo-French jackés, plural, diminutive of Middle French jaque short jacket, from jacques peasant, from the name Jacques James
Date: 15th century
1.
a. : a garment for the upper body usually having a front opening, collar, lapels, sleeves, and pockets
b. : something worn or fastened around the body but not for use as clothing
2.
a.
(1) : the natural covering of an animal
(2) : the fur or wool of a mammal
b. : the skin of a potato
3. : an outer covering or casing: as
a.
(1) : a thermally nonconducting cover
(2) : a covering that encloses an intermediate space through which a temperature-controlling fluid circulates
(3) : a tough cold-worked metal casing that forms the outer shell of a built-up bullet
b.
(1) : a wrapper or open envelope for a document
(2) : an envelope for enclosing registered mail during delivery from one post office to another
c.
(1) : a detachable protective cover for a book
(2) : a paper or cardboard envelope for a phonograph record
• jack·et·less -ləs adjective
II. transitive verb
Date: 1856
: to put a jacket on : enclose in or with a jacket