From a derivative of is (force; compare eschon, a form of echo); forcefulness (literally or figuratively) -- ability, might(-ily), power, strength.
see GREEK echo
ἰσχύϊ (ischui) − 2 Occurrences
ἰσχὺν (ischun) − 1 Occurrence
ἰσχύος (ischuos) − 6 Occurrences
ἰσχὺς (ischus) − 1 Occurrence
