5. twentieth

adjective. (ˈtwɛntiːˌɛθ, ˈtwɛnˌtiːɛθ) Coming next after the nineteenth in position.

6. twentieth

noun. (ˈtwɛntiːˌɛθ, ˈtwɛnˌtiːɛθ) Position 20 in a countable series of things.