The action of decorating something or the decorative elements used; elaborate or excessive decoration, especially in art, architecture, or music.
From Latin ornamentum, from ornare meaning 'to equip, furnish, or adorn.' The word has maintained its association with decorative elements that beautify but aren't strictly necessary for function.
Ornamentation is like putting ornaments on a Christmas tree - beautiful decorative additions that make something special, but the tree would still be a tree without them!
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