Truth

John 8:32 (NIV)
Then you will know the truth, and the truth will set you free.

John 1:14 (NIV)
The Word became flesh and made His dwelling among us. We have seen His glory, the glory of the one and only Son from the Father, full of grace and truth.

John 14:6 (NIV)
Jesus answered, "I am the way and the truth and the life. No one comes to the Father except through me.

Truth = alétheia

Definition: truth, but not merely truth as spoken; truth of idea, reality, sincerity, truth in the moral sphere, divine truth revealed to man, straightforwardness.

[In ancient Greek culture, 225 (alḗtheia) was synonymous for "reality" as the opposite of illusion, i.e. fact.]


Reference:
http://biblehub.com/john/8-32.htm

http://biblehub.com/greek/225.htm

http://biblehub.com/kjvs/john/14.htm