Word Summary
ischys: strength, might
Original Word: ἰσχύςTransliteration: ischys
Phonetic Spelling: (is-khoos')
Part of Speech: Noun, Feminine
Short Definition: strength, might
Meaning: strength, might
Strong's Concordance
ability, might, power, strength. 
From a derivative of is (force; compare eschon, a form of echo); forcefulness (literally or figuratively) -- ability, might(-ily), power, strength. 
see GREEK echo 
Thayer's Greek Lexicon
STRONGS NT 2479: ἰσχύςἰσχύς, 
ἰσχύος, 
ἡ (
ἴσχω (allied with 
ἔσχον; to hold in check)) (from 
Hesiod down), the 
Sept. especially for 
כֹּחַ, 
חַיִל, 
עֹז, 
גְּבוּרָה; 
ability, force, strength, might: 
2 Peter 2:11 (joined with 
δύναμις); 
Revelation 5:12; 
Revelation 7:12; 
τό κράτος τῆς ἰσχύος, 
power (over external things) afforded 
by strength, Ephesians 1:19; 
Ephesians 6:10 (
Isaiah 40:26); 
ἡ δόξα τῆς ἰσχύος (see  
δόξα, III. 3 b. 
α. at the end), 
2 Thessalonians 1:9; 
κράζειν ἐν ἰσχύει, with strength, mightily, 
Revelation 18:2 Rec.; 
ἐξ ἰσχύος, of one's strength, to the extent of one's ability, 
1 Peter 4:11; with 
ὅλης added, 
Mark 12:30, 33; 
Luke 10:27 (here 
L text 
T Tr WH read 
ἐν ὅλῃ τῇ ἰσχύι). (Synonym: see  
δύναμις, at the end.)