Etymology
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abstainer (n.)

mid-15c., "one who practices self-denial," agent noun from abstain. Modern use in the temperance movement and specifically with reference to alcoholic drink is from 1862. French used abstème in this sense, from Latin abstemius.

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Definitions of abstainer

abstainer (n.)
someone who practices self denial as a spiritual discipline;
Synonyms: ascetic
abstainer (n.)
a person who refrains from drinking intoxicating beverages;
Synonyms: abstinent / nondrinker
From wordnet.princeton.edu