IPA: /ˌruːɪˈneɪʃən/
KK: /ruˈneɪʃən/
The process or result of causing something to be destroyed or severely damaged.
The heavy rains led to the ruination of the old building.
Ruination → It is formed from "ruin" (from Latin "ruina", meaning a fall or collapse) and "-ation" (meaning the action or process of). The word "ruination" refers to the process of causing something to fall into ruin or destruction.
Think of the word 'ruin' which means to fall apart, and '-ation' indicates a process. So, ruination is the process of something falling into ruin.