1. (of lines, planes, or surfaces) never meeting or crossing
   - nonintersecting

See also: parallel

• oppositionist
• oppositive
• oppress
• oppressed
• oppression
• oppressive
• oppressively
• oppressiveness
• oppressor
• opprobrious
• opprobriously
• opprobrium
• oppugn
• oppugnant
• Ops
• Opsanus tau
• opsin
• opsonin
• opsonisation
• opsonise
• opsonization
• opsonize
• opt
• opt out
• optative