IPA: /ˌdiːkəmˈpəʊzɪʃən/
KK: /ˌdiːkəmˈpoʊzɪʃən/
The process of breaking down or decaying organic materials into simpler parts or elements.
The decomposition of leaves enriches the soil with nutrients.
Decomposition → It is formed from "de-" (meaning down or away) and "componere" (meaning to put together). The word describes the process of breaking down something that was once put together, such as organic matter decaying into simpler substances.
Think of something being 'broken down' ('de-') from its original 'put together' state ('componere') — that's what decomposition means.