present participle

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

• noun A participle expressing present action, in English formed by the infinitive plus -ing and used to express present action in relation to the time indicated by the finite verb in its clause, to form progressive tenses with the auxiliary be, and to function as a verbal adjective.

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

• noun grammar A verb form that indicates an ongoing action or state in the present and which can function as an adjective.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a participle expressing present action; in English is formed by adding -ing