c.1380, "to withhold oneself," from O.Fr. abstenir, from L. abstinere "withhold," from ab(s)- "from, away from" + tenere "to hold" (see tenet). Specifically of liquor, attested from 1382. Of voting, 1885.
Main Entry: ab·stain Pronunciation: &b-'stAn, ab- Function: intransitive verb : to refrain from exercising federal jurisdiction over a case : cause an abstention
Main Entry: ab·stain Pronunciation: &b-'stAn, ab- Function: intransitive verb : to refrain deliberately and often with an effort of self-denialfrom an action or practice (as consumption of a food or a drug or indulgence in sexual intercourse) —ab·stain·ernoun