IPA: /ˌɔːrnəˈmenˈteɪʃən/
KK: /ɔrnəˈmɛnˌteɪʃən/
Something that is used to make something more attractive or beautiful, often by adding decorative elements.
The ornamentation on the building included intricate carvings and colorful tiles.
Ornamentation → It is formed from "ornare" (meaning to adorn or decorate) and the suffix "-tion" (indicating the action or process of). The word "ornamentation" refers to the process of decorating or adorning something.
Think of the word 'ornate' which means decorated, and remember that 'ornamentation' is the action of adding decoration.