1. adjective /ˌɔːnəˈmɛntl,ˌɔɹnəˈmɛntl/
Serving to ornament; characterized by ornament; beautifying; embellishing.
Some think it most ornamental to wear their bracelets on their wrists; others, about their ankles.
2. noun /ˌɔːnəˈmɛntl,ˌɔɹnəˈmɛntl/
An ornamental plant.
Wikipedia foundation.