1. Of or relating to a geological eon (longer than an era)
   - eonian [N. Amer] 
2. Continuing forever or indefinitely
   - ageless, eonian [N. Amer], eternal, everlasting, perpetual, unending, unceasing

See also: aeon, lasting, permanent

• supersensitive
• supersensitized
• supersession
• superset
• supersize
• superslasher
• supersonic
• superstar
• superstardom
• superstate
• superstition
• superstitious
• superstitious notion
• superstitiously
• superstore
• superstrate
• superstratum
• superstring
• superstructure
• supersymmetric
• supersymmetry
• supertanker
• supertax
• supertitle
• supertonic