1. Of a person, not wearing something, typically clothing or make-up. Note the French spelling of "natural" in this phrase. We can't go to a nude beach—I don't want to see complete strangers au naturel! Jane always looks like a different person without her make-up, totally au naturel.

2. Of food, prepared in a very simple way. Note the French spelling of "natural" in this phrase. I know you're on a diet right now, so I prepared this au naturel, with no salt or sauces.