1. eighteenth

adjective. ['eɪˈtiːnθ, ˈeɪˈtiːnθ'] coming next after the seventeenth in position.

Rhymes with Eighteenth Amendment

2. eighteenth

noun. ['eɪˈtiːnθ, ˈeɪˈtiːnθ'] position 18 in a countable series of things.

3. amendment

noun. ['əˈmɛndmənt'] the act of amending or correcting.

4. amendment

noun. ['əˈmɛndmənt'] a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.).