Etymology
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joint (n.)

c. 1300, "an (anatomical) joint, a part of a body where two bones meet and move in contact with one another, the structure that holds such bones together," from Old French joint "joint of the body" (12c.), from Latin iunctus "united, connected, associated," past participle of iungere "to join together," from nasalized form of PIE root *yeug- "to join." Related: Joints.

In general use from late 14c., of insect and plant parts, also "that which joins two components of an artificial structure." In butchering, "cut of meat on the bone," early 15c. Slang or cant meaning of "place, building, establishment" (especially one where persons meet for shady activities) first recorded 1877; earlier it was used in an Anglo-Irish context (1821), perhaps on the notion of a private side-room, one "joined" to a main room. In late 19c. U.S. use especially "an opium-smoking den" (1883).

Meaning "marijuana cigarette" (1938) is perhaps from notion of something often smoked in common, but there are other possibilities; earlier joint in drug slang meant "hypodermic outfit" (1935). Meaning "prison" is attested from 1953 but probably is older. Out of joint in the figurative sense "disordered, confused, gone wrong" is from early 15c. (literally, of bone displacement, late 14c.). Joint-stock "of or pertaining to holding stock in shares" is from 1610s.

joint (adj.)

early 15c., "united or sharing" (in some activity), from Old French jointiz (adj.) "joined together, close together" and Old French joint (14c.), past-participle adjective from joindre "to join, connect, unite," from Latin iungere "to join together," from nasalized form of PIE root *yeug- "to join."

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Definitions of joint
1
joint (n.)
(anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion);
Synonyms: articulation / articulatio
joint (n.)
a disreputable place of entertainment;
joint (n.)
a piece of meat roasted or for roasting and of a size for slicing into more than one portion;
Synonyms: roast
joint (n.)
junction by which parts or objects are joined together;
joint (n.)
marijuana leaves rolled into a cigarette for smoking;
Synonyms: marijuana cigarette / reefer / stick / spliff
joint (n.)
the shape or manner in which things come together and a connection is made;
2
joint (v.)
fit as if by joints;
joint (v.)
provide with a joint;
the carpenter jointed two pieces of wood
Synonyms: articulate
joint (v.)
fasten with a joint;
joint (v.)
separate (meat) at the joint;
3
joint (adj.)
united or combined;
joint owners
a joint session of Congress
joint (adj.)
affecting or involving two or more;
joint ownership
joint income-tax return
joint (adj.)
involving both houses of a legislature;
a joint session of Congress
From wordnet.princeton.edu