1. Last in an indefinitely numerous series
   - umteenth, umptieth

See also: ordinal

Encyclopedia: Umpteenth

• airplane ticket
• airplay
• airport
• airport terminal
• airpost
• airs
• airscrew
• airship
• airsick
• airsickness
• airside
• airspace
• airspeed
• airstream
• airstrip
• airt
• airtight
• airtime
• airwave
• airway
• airwoman
• airworthiness
• airworthy
• airy
• airy-fairy