allegro [I]—fast, lively tempo. From the Italian word for cheerful or gay.
andante [I]—moderately slow tempo (e.g. walking). Faster than adagio but slower than allegretto
assai—very much. Intensifies the direction of its neighboring words, e.g. "allegro assai", very fast
brio [I], con brio, brioso—vigor, vigorously, with fire
chamber music, Kammermusik [G], musique de chambre [F], musica da camera [I], musica cameralis [L]—"Classical Music" for a small ensemble, generally 8 or fewer players with a canonical emphasis on 3-6 players. explore
duo, duet, dueto [S], duetto [I], duett [G]—a work for two instruments; the ensemble itself
grazioso [I], con grazia, gratioso, graziös [G], Mit Grazie—graceful, gracefully; easy
larghetto—slow, but a bit faster than largo
mosso—moved, with motion, stirred, agitated
opus [L], opera[pl], Op., Opp, WoO, Op. posth—work, as in a work of art. For unique identification, publishers/composers often assign an "opus number", abbreviated as "Op." (e.g. Op. 1). A range of works by opus number, uses the plural "opp." (e.g. "Opp. 1-3"). A single opus number may refer to a collection of works (e.g. a set of quartets) giving rise to designations like "Op. 1, No. 4". For misc. works without opus numbers, "WoO" is often used (e.g."Without Opus"). Posthumously assigned numbers may use "Op. posth". Opus numbers may not precisely reflect chronology (publication vs. composition), can be erroneous, sparse or duplicative. Thus, the works of some historically important composers may use separate catalog numbers (e.g. Bach, Haydn, Schubert). See wiki
presto—very fast, more so than allegro.
quasi—almost, almost like, as if
risoluto [I], resoluto—resolute, decisively, boldly, with vigor
saltarello—a gay, sprightly, merry dance of Spanish origin dating back to the middle ages. Generally features a triple meter and a leaping dance step (saltare = to jump)
scherzo—lively, brisk, typically in a triple meter; usually a three-part form with central, contrasting trio
Siciliana, Siciliano, Sicilienne—a musical form often included as a movement within larger pieces of music starting in the Baroque period. It is in a slow 6/8 or 12/8 time with lilting rhythms making it somewhat resemble a slow jig, and is usually in a minor key. It was used for arias in Baroque operas, and often appeared as a movement in instrumental works. The siciliano evokes a pastoral mood, and is often characterized by a large number of dotted rhythms. wiki
suite—a set of instrumental pieces (movements) played together to create a larger whole. Suites tend towards collections of dances, frequently in the same key, preceded by a prelude, introduction or overture.