1. 1,000,000,000 periods per second
   - gigahertz, GHz, gigacycle, Gc

Type of: rate

• family Caprifoliaceae
• family Caprimulgidae
• family Caproidae
• family Capromyidae
• family Capsidae
• family Carabidae
• family Carangidae
• family Carapidae
• family Carcharhinidae
• family Carchariidae
• family Cardiidae
• family Cariamidae
• family Caricaceae
• family Carpinaceae
• family Caryocaraceae
• family Caryophyllaceae
• family Castoridae
• family Casuaridae
• family Casuarinaceae
• family Cathartidae
• family Catostomidae
• family Caviidae
• family Cebidae
• family Cecidomyidae
• family Cecropiaceae