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

See also: uncertain

• epact
• epanalepsis
• epanaphora
• epanodos
• epanorthosis
• eparch
• eparchial
• eparchy
• epaulet
• epaulette
• epauliere
• epeirogenesis
• epeirogeny
• ependyma
• epenthesis
• epenthetic
• epergne
• epexegesis
• epha
• ephah
• ephebe
• ephedra
• Ephedra sinica
• Ephedraceae
• ephedrine