I feel compelled to speak about this subject largely because in recent years, yoga has become a popular, fad fitness even though its origins are as old as time. And, in many respects has lost a bit of its spirituality. 'Namaste' is not some weird word used only for the yoga gurus but for everyone here on this earth. Actually, if we used Namaste more often and knew what it actually meant, then maybe everyone in our world would fair a bit better. Namaste is a sanskrit word that loosely translates to "I am acknowledging the divine in you that also resides in me" one of my favorite translations. It can also mean "I recognize God within you as he is in me as well" and also "I recognize the God in you as he is everywhere too" and such. This translation stems from the belief that we are all parts of the whole. As God, The Universe, Source, whatever you call him/her/it is everywhere and in everything, and as we are all part(icipators) in this world, we are also divine.
So again, when you're sitting in that yoga class and the instructor says 'Namaste', say it back with full intention and full knowing of what it means. I even encourage you to use it outside of yoga.
Yours in love and light.
Namaste