"Celibate" and "unmarried" have been synonyms, so being unmarried (no matter how sexually active) IS being celibate. 

Chastity and celibacy are not the same, as an editor once cautioned me. I have been later told that "celibacy"--because of so much misuse of the term--can now mean concurrent unmarried AND chaste.

Alas, when I hear all this talk about divorced-and-remarried people having to  "live like brother and sister," I guess some folks in the Church think there should be millions of frustrated non-celibate folks who are also chaste.

I guess now the dictionary--and the Church--allows someone to be both non-celibate AND chaste?

Oh the confusion.