purge

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To clear (a container or space, for example) of something unclean or unwanted.
• intransitive verb To remove or eliminate (unwanted physical matter).
• intransitive verb To rid (a person or thing) of something unwanted.
• intransitive verb To remove or eliminate (an unwanted element).
• intransitive verb Law To clear (a person) of a charge or conviction.
• intransitive verb To rid (a nation or political party, for example) of people considered undesirable.
• intransitive verb To get rid of (people considered undesirable).
• intransitive verb To cause evacuation of (the bowels).
• intransitive verb To induce evacuation of the bowels in (an individual).
• intransitive verb To clear (a storage device) of unwanted data.
• intransitive verb To delete (unwanted data) from a storage device.
• intransitive verb Medicine To undergo or cause an emptying of the bowels.
• intransitive verb To vomit or force oneself to vomit, especially as a symptom of an eating disorder.
• noun The act or process of purging.
• noun Something that purges, especially a medicinal purgative.
• noun An instance of vomiting or of forcing oneself to vomit.

from The Century Dictionary.

• To vomit.
• noun The act of purging; purgation.
• noun Anything that purges; specifically, a medicine that evacuates the intestines; a cathartic.
• noun A plant of Virginia, probably Trinsteum perfoliatum, the root of which was used as a purgative by the aborigines.
• To cleanse or purify by separating and carrying off whatever is impure, heterogeneous, foreign, or superfluous; cleanse; clean, or clean out.
• To remove by some cleansing or purifying process or operation; clear or wash away: often followed by away and off.
• To clear from moral defilement or guilt: in this and next sense often followed by of or from.
• To clear from accusation of a crime, as by ordeal, or from charge of contempt, as by oath showing that there was no wrong intent; free from taint or suspicion of crime.
• To clarify; defecate, as liquors.
• To operate on by or as by means of a cathartic.
• To void.
• To trim.
• To become pure by clarification.
• To take a purge; produce evacuations from the intestines by means of a cathartic.
• To be cleansed or purified by the escape of certain gases, as a lake or river. See purging, 2.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To become pure, as by clarification.
• intransitive verb To have or produce frequent evacuations from the intestines, as by means of a cathartic.
• noun The act of purging.
• noun That which purges; especially, a medicine that evacuates the intestines; a cathartic.
• transitive verb To cleanse, clear, or purify by separating and carrying off whatever is impure, heterogeneous, foreign, or superfluous.
• transitive verb (Med.) To operate on as, or by means of, a cathartic medicine, or in a similar manner.
• transitive verb To clarify; to defecate, as liquors.
• transitive verb To clear of sediment, as a boiler, or of air, as a steam pipe, by driving off or permitting escape.
• transitive verb To clear from guilt, or from moral or ceremonial defilement.
• transitive verb (Law) To clear from accusation, or the charge of a crime or misdemeanor, as by oath or in ordeal.
• transitive verb To remove in cleansing; to deterge; to wash away; -- often followed by away.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An act of purging
• noun medicine An evacuation of the bowels or a vomiting.
• noun A cleansing of pipes.