G1411 δύναμις (dýnamis)

KJV renderings: ability, abundance, meaning, might(-ily, -y, -y deed), (worker of) miracle(-s), power, strength, violence, mighty (wonderful) work
Strong's definition: force (literally or figuratively); specially, miraculous power (usually by implication, a miracle itself)
Derivation: from G1410 (δύναμαι);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.