1. (cosmology) one billion (10^9) years
   "the universe is approximately 14 gigayears old"

Encyclopedia: Gigayear

• fluorouracil
• fluorspar
• fluosilicate
• fluosilicic acid
• fluoxetine
• fluoxetine hydrocholoride
• fluphenazine
• flurazepam
• flurazepam hydrochloride
• flurbiprofen
• flurry
• flush
• flush down
• flush it
• flush toilet
• flush-seamed
• flushed
• flushless toilet
• fluster
• flustered
• flute
• flute glass
• flute player
• fluting
• flutist