1. One part in a billion equal parts
   - billionth

Derived forms: one-billionths

Type of: common fraction, simple fraction, vulgar fraction [Brit]

• one-twelfth
• one-two
• one-upmanship
• one-way
• one-way light time
• one-way street
• one-winged
• one-woman
• one-year
• one-year-old
• Onega
• Oneida
• oneiric
• oneirism
• oneiromancer
• oneiromancy
• oneness
• onerous
• onerously
• onerousness
• oneself
• onetime
• ongoing
• ONI
• onion