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

Encyclopedia: Gigayear

• Darryl Francis Zanuck
• Darryl Zanuck
• Darsana
• dart
• dart player
• dart thrower
• dartboard
• darter
• Dartmouth
• Dartmouth College
• darts
• Darvon
• Darwin
• Darwin tulip
• Darwinian
• Darwinism
• Daryacheh-ye Orumiyeh
• das
• Das Kapital
• dash
• dash down
• dash off
• dash-pot
• dashboard
• dashed