Thayer's Greek Lexicon

 1. strength power, ability
  1) inherent power, power residing in a thing by virtue of its
nature, or which a person or thing exerts and puts forth
  2) power for performing miracles
  3) moral power and excellence of soul
  4) the power and influence which belong to riches and wealth
  5) power and resources arising from numbers
  6) power consisting in or resting upon armies, forces, hosts

For Synonyms see entry G5820