- A carrying or taking away; removal.
- (medicine) The surgical removal of a body part; amputation.
- (geology) The erosion of a glacier.
- (physics) The dissipation of the heat of re-entry of a spacecraft, meteor, or similar object.
- one who ablates
adjective (WikiSaurus?-link, active)
- A person or thing that is acting or capable of acting.
- Having the power or quality of acting; causing change; communicating action or motion; acting; — opposed to passive, that receives; as, certain active principles; the powers of the mind.
- Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal.
- In action; actually proceeding; working; in force; — opposed to quiescent, dormant, or extinct.
- active laws
- active hostilities
- an active volcano
- Given to action; constantly engaged in action; energetic; diligent; busy; — opposed to dull, sluggish, indolent, or inert; as, an active man of business; active mind; active zeal.
- Requiring or implying action or exertion; — opposed to sedentary or to tranquil; as, active employment or service; active scenes.
- Given to action rather than contemplation; practical; operative; — opposed to speculative or theoretical; as, an active rather than a speculative statesman.
- Brisk; lively; as, an active demand for corn.
- Implying or producing rapid action.
- an active disease
- an active remedy
- Applied to a form of the verb; — opposed to passive. See active voice.
- Applied to verbs which assert that the subject acts upon or affects something else; transitive.
- Applied to all verbs that express action as distinct from mere existence or state.
- (italbrac, gay sexual slang)
- (italbrac, of a homosexual man) enjoying a role in anal sex in which he penetrates, rather than being penetrated by his partner
- such a role in anal sex
- the atmosphere of the Earth and the region of space around it
- the industry concerned with aircraft, missiles, satellites and spacecraft
- of, or relating to the Earth's atmosphere and nearby space
- of, or relating to the science, technology and industry associated with aircraft, missiles, satellites and spacecraft
- (astronomy) An asteroid possessing an orbit that crosses the orbit of the Earth and an orbital period of over one year, with semimajor axis, semimajor axes greater than 1 AU, and perihelion distances less than 1.017 AU.
- (Greek, Roman mythology): The son of Zeus and Leto (or Jupiter and Latona), and the twin brother of Artemis (or Diana).<ref>Oxford Dictionary of World Mythology, Arthur Cotterell, Oxford University Press, 1986</ref> He was the god of light, music, medicine, and poetry;<ref name="Webster's c 2001">Webster's College Dictionary, Random House, 2001</ref> and prophecy, dance, manly beauty, and more.
- A very handsome young man.<ref name="Webster's c 2001"/>
- Space, U.S. A three-man spacecraft designed to travel to and land on the moon.
- A town in Pennsylvania, USA.
- A butterfly (Parnassius apollo, a large swallowtail with black and red spots on white wings).
- Biblical Hebrew name meaning literally "lion of God", and used also in reference to the city of Jerusalem.
- Name of a spirit in the play The Tempest by Shakespeare.
- Name of the twelfth and brightest moon of the planet Uranus.
- (given name, male), often borrowed from Spanish usage.
- (given name, female), mostly of persons born after 1970.
- A member of the crew of a spaceship or other spacecraft, or someone trained for that purpose
- referring to travel in outer space
- navigation, Navigation through space.