IPA: /ˌdɛvəˈsteɪʃən/
KK: /ˌdɛvəˈsteɪʃən/
The act of causing great destruction or damage to something, often leaving it in ruins.
The hurricane caused widespread devastation in the coastal towns.
Devastation is formed from "de-" (meaning down or away) and "vastare" (meaning to lay waste or destroy). The word describes the act of laying waste to an area, resulting in destruction and ruin.
Think of something being 'laid waste' ('vastare') and 'taken away' ('de-') — that's why devastation means destruction.