The Meaning of "Selah" in the Psalms
... "Selah" is believed to derive from one of two Hebrew roots:
The root "salal" (סָלַל), meaning "to lift up," "to exalt," or "to cast up" (as in a highway). This interpretation suggests a command to elevate, either in voice, instruments, or spirit.
The root "salah" (סָלָה) ...