Abstain v. i. : To hold one's self aloof; to forbear or refrain voluntarily, and especially from an indulgence of the passions or appetites; -- with from.

Abstain v. t. : To hinder; to withhold.

Example:
How can I Abstain from pornography and masturbation so I can focus on my homework?

Taxonomy
abstention, campaigns, Amano, Election, cast, ballot, measure, blank vote, French presidential election, free encyclopedia, Jean-Marie Le Pen, IAEA Director General, Minty, Echávarri, participant, drawing, Jacques Chirac, blank ballot.

Defination from the web:
abstain in the case of a real or perceived conflict of interest. ... If a majority of members of the United Nations General Assembly or one of its committees abstain on a measure, then the measure fails. ...