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

Encyclopedia: Gigayear

• suppressive
• suppressive fire
• suppressor
• suppressor gene
• suppurate
• suppurating sore
• suppuration
• suppurative
• supra
• supra expressionism
• supracostal
• suprainfection
• supranational
• supranormal
• supraocular
• supraorbital
• supraorbital ridge
• supraorbital torus
• supraorbital vein
• suprapubic
• suprarational
• suprarenal
• suprarenal gland
• suprarenalectomy
• suprasegmental