The words abstinence and celibacy are often used interchangeably, but are different. Abstinence is the absence of intercourse (even for an individual who is married), but celibacy is the avoidance of all forms of sexual activity (including, but not limited to, the state of marriage itself).
Abstinence means doing without for a time.
Celibacy means vows of no sex but molesting children anyway.
I've been wrong before, but I think celibacy JUST means not being married. Abstinence is the no-sex term, so one might have sex and still be celibate, or be married but not have sex.