1. (

• impaction ,

) the condition of being pressed closely together and firmly fixed ;

2. (

• impaction ,

) a disorder in which feces are impacted in the lower colon ;

3. (

• impaction ,
• impacted_tooth

) a disorder in which a tooth is so crowded in its socket that it cannot erupt normally ;

4. (

• impingement ,
• impaction

) a sharp collision produced by striking or dashing against something ;