Etymology: Latin impactus, past participle of impingere to push against — more at impinge
a. to fix firmly by or as if by packing or wedging
b. to press together
a. to have a direct effect or impact on ; impinge on
b. to strike forcefully; also to cause to strike forcefully
1. to have an impact — often used with on
2. to impinge or make contact especially forcefully
• impactful adjective
• impactive adjective
• impactor also impacter noun
a. an impinging or striking especially of one body against another
b. a forceful contact or onset; also the impetus communicated in or as if in such a contact
2. the force of impression of one thing on another ; a significant or major effect <the impact of science on our society> <an environmental impact study> Synonyms: impact, collision, shock, concussion mean a forceful, even violent contact between two or more things. impact may be used to imply contact between two things, at least one of which is impelled toward the other <the glass shattered on impact with the floor>. collision implies the coming together of two or more things with such force that both or all are damaged or their progress is severely impeded <the collision damaged the vehicle>. shock often denotes the effect produced by a collision and carries the suggestion of something that strikes or hits with force <the shock of falling rocks>. concussion when not in technical use, often suggests the shattering, disrupting, or weakening effects of a collision, explosion, or blow <bystanders felt the concussion of the blast>.
New Collegiate Dictionary. 2001.