IPA: /ˈtrɔːmətɪzəm/
KK: /ˈtrɔːmətɪzəm/
A condition or injury caused by a physical or emotional shock.
After the accident, he suffered from severe traumatism that affected his mental health.
Traumatism is formed from "trauma" (from Greek "trauma", meaning wound or injury) and "-ism" (a suffix used to form nouns indicating a state or condition). The word refers to a condition or state resulting from a wound or injury.
Think of 'trauma' as a wound or injury, and '-ism' indicating a state — so traumatism means a state resulting from an injury.