1. Very uncertain
   "left everything up in the air" 
2. Not yet determined
   "plans are still up in the air"

See also: uncertain

• Alice Hamilton
• Alice Malsenior Walker
• Alice Paul
• Alice Walker
• Alice-Josephine Pons
• Alicia Alonso
• alicyclic
• alicyclic compound
• alidad
• alidade
• alien
• alien absconder
• alienability
• alienable
• alienage
• alienate
• alienated
• alienating
• alienation
• alienation of affection
• alienator
• alienee
• alienism
• alienist
• alienor