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

• Ferdinand Julius Cohn
• Ferdinand Magellan
• Ferdinand of Aragon
• Ferdinand the Catholic
• Ferdinand the Great
• Ferdinand V
• Ferdinand Victor Eugene Delacroix
• Fere phenomenon
• Ferenc Molnar
• feretory
• Fergon
• fergusonite
• feria
• ferial
• ferine
• Fermat
• fermata
• ferment
• fermentable
• fermentation
• fermentation alcohol
• fermentative
• fermenting
• fermentologist
• fermi