Brown Driver Briggs

 n f
1. firmness, faithfulness, truth
  1) sureness, reliability
  2) stability, continuance
  3) faithfulness, reliableness
  4) truth
1d1. as spoken
1d2. of testimony and judgment
1d3. of divine instruction
1d4. truth as a body of ethical or religious knowledge
1d5. true doctrine
adv
2. in truth, truly