What is the meaning of "Defying Gravity" on Glee tv series?

Philippines
July 1, 2010 10:02am CST
I'm just trying to understand what is the meaning of this song. What is your own interpretation of this song? It goes this way: Its time to try defying gravity... I think I'll try defying gravity... Kiss me goodbye I am defying gravity... And you won't bring me down...