IPA: /dɪsˈmæn.təl.mənt/
KK: /dɪsˈmæn.təl.mənt/
The process of taking something apart or breaking it down into its parts.
The dismantlement of the old building took several weeks to complete.
Dismantlement → It is formed from "dis-" (meaning apart) and "mantel" (from Old French *mantel*, meaning a covering or cloak) with the suffix "-ment" (indicating the action or process). The word refers to the process of taking something apart or removing its covering.
Think of taking something 'apart' ('dis-') and removing its 'covering' ('mantel') — that's why dismantlement means the process of taking something apart.