odeon /ōˈdi-ən, -dyən or -dēˈ/, also odeum /-əm/

1. In ancient Greece and Rome, a theatre for musical contests, etc
2. A concert hall

• one of these days
• one of those things
• one-one
• one-on-one
• one or two
• one over the eight
• one-parent families
• one-parent family
• one-person
• one-piece
• one-pieces
• oner
• onerous
• onerously
• onerousness
• onerousnesses
• oners
• ones
• one's best days
• one's better half
• one's cup of tea
• one self
• oneself
• one's fingers are all thumbs
• one's gorge rises