1. The ordinal number of forty-five in counting order
   - 45th

See also: ordinal

• understandably
• understanding
• understandingly
• understate
• understated
• understatement
• understock
• understood
• understrength
• understructure
• understudy
• undersurface
• undertake
• undertaker
• undertaking
• underthings
• undertide
• undertone
• undertow
• undervaluation
• undervalue
• undervest
• underwater
• underwater archaeology
• underwater archeology