Thayer's Greek Lexicon

 1. conviction of the truth of anything, belief; in the NT of a
conviction or belief respecting man's relationship to God and
divine things, generally with the included idea of trust and
holy fervour born of faith and joined with it
  1) relating to God
1a1. the conviction that God exists and is the creator and
ruler of all things, the provider and bestower of eternal
salvation through Christ
  2) relating to Christ
1b1. a strong and welcome conviction or belief that Jesus is
the Messiah, through whom we obtain eternal salvation in
the kingdom of God
  3) the religious beliefs of Christians
  4) belief with the predominate idea of trust (or confidence)
whether in God or in Christ, springing from faith in the same
2. fidelity, faithfulness
  1) the character of one who can be relied on