Selah

Boyd’s Bible Dictionary:

A word of frequent occurrence in Psalms, and supposed to mean an interlude in vocal music, or a pianissimo of all parts

Concise Bible Dictionary:

Strong’s Dictionary of Hebrew Words:

Transliteration:
celah
Phonic:
seh’-law
Meaning:
from 5541; suspension (of music), i.e. pause
KJV Usage:
Selah

Jackson’s Dictionary of Scripture Proper Names:

a rock: crag (2 Kings 14:7) : make prominent

Potts’ Bible Proper Names:

To pause; to rest; elevation; loud; clear:―occurs frequently in Psalms, Psa. 9:16. {Distinctio}