What dose truth mean

OK so my math teacher is a big guy and he sometimes thinks he is better then everyone. One time I walked in to my blogging class and he was was in the class room and I thought "oh no this is not going to go well". So my tec teacher said to my math teacher what do you think we should do for today's topic and he said what is the definition of truth. So I will try to tell you what I think what the definition of truth is. The truth is real, genuine and authentic.