What's the "een" in Halloween?
by 1912, American English, first attested in baseball slang; as a type of music, attested from 1913. Probably ultimately from Creole patois jass "strenuous activity," especially "sexual intercourse" but also used of Congo dances, from jasm (1860) "energy, drive," of African origin (cf. Mandingo jasi, Temne yas), also the source of slang jism.
If the truth were known about the origin of the word 'Jazz' it would never be mentioned in polite society. ["Étude," Sept. 1924]All that jazz "et cetera" first recorded 1939.
"to speed or liven up," 1917, from jazz (n.). Related: jazzed; jazzing.
A form of American music that grew out of African-Americans' musical traditions at the beginning of the twentieth century. Jazz is generally considered a major contribution of the United States to the world of music. It quickly became a form of dance music, incorporating a “big beat” and solos by individual musicians. For many years, all jazz was improvised and taught orally, and even today jazz solos are often improvised. Over the years, the small groups of the original jazz players evolved into the “Big Bands” (led, for example, by Duke Ellington, Count Basie, and Glenn Miller), and finally into concert ensembles. Other famous jazz musicians include Louis Armstrong, Benny Goodman, and Ella Fitzgerald.
: a jazz trumpet/ jazz riffsnoun
[origin unknown; jass was an earlier spelling]