IPA: /ɪmˈpækʃən/
KK: /ɪmˈpækʃən/
A condition where something is packed tightly or becomes stuck, often referring to a mass of material that cannot move easily, such as stool in the intestines.
The doctor diagnosed the patient with an impaction that required immediate treatment.
Impaction is formed from "im-" (meaning into) and "pactio" (from "pactum", meaning to fasten or to press). The word describes the state of being pressed or packed into something, often used in medical contexts to refer to a blockage.
Think of something being 'pressed into' ('im-') a tight space ('pactio') — that's why impaction refers to a blockage.