Etymology
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primo

1740 in music terms, "first, principal," from Italian primo "first, chief," from Latin primus "first" (see prime (adj.)). As slang for "excellent, first-class," perhaps an elaboration of prime (see O). Of drugs, by 1990s, street slang.

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Definitions of primo
1
primo (n.)
the principal part of a duet (especially a piano duet);
2
primo (adj.)
the best of its kind;
From wordnet.princeton.edu