impact

(noun) the striking of one body against another.

(noun) a forceful consequence; a strong effect. Synonyms: wallop. Examples: "The book had an important impact on my thinking." "The book packs a wallop."

(noun) influencing strongly. Synonyms: impingement, encroachment. Example: "They resented the impingement of american values on european culture."

(noun) the violent interaction of individuals or groups entering into combat. Synonyms: shock. Example: "The armies met in the shock of battle."

(verb) press or wedge together; pack together.

(verb) have an effect upon. Synonyms: affect, bear upon, bear on, touch on, touch. Example: "Will the new rules affect me?."