Avoiding alcohol, having gone without can

• A person who refrains from drinking intoxicating beverages
• It's a bent to get drunk around first of November, taking part in Go Sober for October?
• On the wagon
• Refraining from use
• Not indulging appetite for food or drink
• Refraining from alcohol

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Abstinent \Ab"sti*nent\, a. [F. abstinent, L. abstinens, p. pr. of abstinere. See Abstain .] Refraining from indulgence, especially from the indulgence of appetite; abstemious; continent; temperate. --Beau. & Fl.

Wiktionary Word definitions in Wiktionary
Etymology 1 a. refraining from indulgence, especially from the indulgence of appetite; abstemious; continent; temperate. (First attested around 1350 to 1470.) (R:SOED5: page=10) Etymology 2 n. 1 One who abstains; a faster. (First attested around 1350 to ...