1. The ordinal number of fifty in counting order
   - fiftieth

See also: ordinal

• at will
• at work
• at worst
• at-bat
• Atabrine
• Atacama Desert
• Atacama Trench
• atactic
• atactic abasia
• Atakapa
• Atakapan
• ataman
• atar
• ataractic
• ataractic agent
• ataractic drug
• Atarax
• ataraxia
• ataraxic
• ataraxis
• ataraxy
• Ataturk
• atavism
• atavist
• atavistic