Also see definition of "Principal" in Word Study
Study Dictionary
Principal
PRINCIPAL [ISBE]
PRINCIPAL - prin'-si-pal: Appears in the King James Version as a translation of nine Hebrew words (fewer in the Revised Version (British and American)), in one case (Isa 28:25) being used quite wrongly and in 2 Ki 25:19 (Jer 52:25); 1 Ch 24:31 gives a wrong sense (all corrected in the Revised Version (British and American)). In 1 Ki 4:5, "principal officer" (the American Standard Revised Version "chief minister") is an arbitrary translation of kohen to avoid "priest" (so the English Revised Version; compare 2 Sam 8:18).
Also see definition of "Principal" in Word Study