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

Type of: rate

• user interface
• user-friendliness
• user-friendly
• username
• Ushas
• usher
• usher in
• usher out
• usherette
• ushering in
• using
• using up
• Uskub
• USMC
• USN
• Usnea
• Usnea barbata
• Usneaceae
• Usonian
• USP
• USPS
• usquebaugh
• USS
• USS Cole
• Ussher