|1.||the act of one body, object, etc, striking another; collision|
|2.||the force with which one thing hits another or with which two objects collide|
|3.||the impression made by an idea, cultural movement, social group, etc: the impact of the Renaissance on Medieval Europe|
|4.||to drive or press (an object) firmly into (another object, thing, etc) or (of two objects) to be driven or pressed firmly together|
|5.||to have an impact or strong effect (on)|
|[C18: from Latin impactus pushed against, fastened on, from impingere to thrust at, from pangere to drive in]|
impaction im·pac·tion (ĭm-pāk'shən)
The process or condition of being impacted.