: the onetime fifth grade of commissioned officer in a British cavalry troop who carried the standard
b
: the onetime lowest commissioned rank in the U.S. cavalry
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Like the trumpet, the cornet is a brass instrument with three valves, but its bore is somewhat more conical. Its range parallels that of the trumpet. It evolved in the 1820s, and its agility made it a very popular solo instrument. It often displaced the trumpet in 19th-century orchestras, and it preceded the trumpet in modern dance and jazz bands. Recent developments have made the two instruments very similar, and the cornet's popularity has waned considerably as a result.
Middle English cornet, cornette "six-holed wooden wind instrument" (now usually cornett or cornetto), borrowed from Middle French cornet, from corn "horn" (going back to Old French, going back to Latin cornum, cornū) + -et-et entry 1 — more at horn
Noun (2)
borrowed from Middle French cornette "lappet terminating a woman's headdress, pennon, standard of a troop, officer holding the standard," from corne "horn, wimple with horn-like appendages," going back to Latin cornua, plural (taken as singular) of cornū "horn" — more at horn