Poco—little. Poco a poco—little by little.
Poi—then. E poi la coda—and then the coda.
Possibile—possible. Forte possibile—as loudly as possible.
Quasi—in the manner of. Allegro quasi andante—a fairly rapid movement, yet in the style of an andante; almost as slow as an andante.
Sans—without. Sans pedales—without pedals.
Sempre—always, or continually. Sempre forte—a long passage to be played forte throughout its entirety.
Senza—without. Senza accompagnamento—without accompaniment.
Sino, sin—as far as. See [p. 14], note.
Solo—alone. Opposite of ensemble.
Sub—under or lower. Sub-dominant—the under dominant.