from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The striking of one body against another; collision. See Synonyms at collision.
- n. The force or impetus transmitted by a collision.
- n. The effect or impression of one thing on another: still gauging the impact of automation on the lives of factory workers.
- n. The power of making a strong, immediate impression: a speech that lacked impact.
- transitive v. To pack firmly together.
- transitive v. To strike forcefully: meteorites impacting the lunar surface.
- transitive v. Usage Problem To have an effect or impact on: "No region ... has been more impacted by emerging demographic and economic trends” ( Joel Kotkin).
- intransitive v. Usage Problem To have an effect or impact.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The force or energy of a collision of two objects.
- n. A forced impinging.
- n. A significant or strong influence; an effect.
- v. To compress; to compact; to press or pack together.
- v. To influence; to affect; to have an impact on.
- v. To collide or strike.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To drive close; to press firmly together: to wedge into a place.
- transitive v. To affect or influence, especially in a significant or undesirable manner.
- transitive v. To collide forcefully with; to strike.
- n. Contact or impression by touch; collision; forcible contact; force communicated.
- n. The single instantaneous stroke of a body in motion against another either in motion or at rest.
from The Century Dictionary and Cyclopedia
- To drive close; press closely or firmly; pack in.
- n. The act of striking against something; a blow; a stroke.
- n. Specifically — In mech., the blow, or act of striking, of a body having momentum; also, the change of momentum in amount and direction produced by such a blow.
- n. In gunnery, the single blow of a projectile against a fixed or moving object.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. press or wedge together; pack together
- n. a forceful consequence; a strong effect
- n. influencing strongly
- v. have an effect upon
- n. the striking of one body against another
- n. the violent interaction of individuals or groups entering into combat
From Latin impāctus, past participle of impingere, to push against; see impinge.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin impāctus, perfect passive participle of impingō ("dash against, impinge"). (Wiktionary)