Definitions from Wiktionary (J)

▸ noun:  (slang) A term for a marijuana cigarette ('joint').
▸ noun:  (mathematics) An alternative version of i, the positive square root of -1; used in the context of electronics.
▸ noun:  (mathematics) The second unit vector, after i
▸ noun:  In the name of a serial publication: abbreviation of Journal.
▸ noun:  (slang, chiefly in the plural) (plural Js or J's) an Air Jordan shoe
▸ noun:  (slang) (plural Js or J's) A marijuana cigarette. (Abbreviation of joint.)
▸ noun:  (law, postnominal) (plural JJ) Abbreviation of judge or justice.
▸ noun:  (British, road transport) Abbreviation of junction. [The act of joining, or the state of being joined.]
▸ noun:  (card games) Abbreviation of jack. [A coarse mediaeval coat of defence, especially one made of leather.]
▸ noun:  (basketball) Abbreviation of jump shot. [(basketball) A shot in which the player releases the ball at the highest point of a jump.]
▸ noun:  (religion) Abbreviation of Jehovist. [The writer of the passages of the Old Testament, especially those of the Pentateuch, in which the Supreme Being is styled Jehovah. See Elohist.]

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