1. Depending on free oxygen or air
   - aerobic, aerophilic

See also: aerobiotic, oxidative

• one hundred twenty-five
• one iron
• one million million
• one million million million
• one of the boys
• one of these days
• one one's coattails
• one percent
• one shot
• one thousand
• one thousand million
• one thousand thousand
• one up
• one-and-one
• one-armed
• one-armed bandit
• one-billionth
• one-celled
• one-dimensional
• one-dimensional language
• one-dimensionality
• one-eared
• one-eighth
• one-eyed
• geotropic