1. Dissenting (especially dissenting with the majority opinion)
   - divisive, factious

See also: discordant, dissent

• up to your neck
• up-and-coming
• up-bow
• up-to-date
• up-to-dateness
• originate in
• origination
• origination fee
• originative
• originator
• orinasal
• orinasal phone
• Orinase
• Orinoco
• Orinoco River
• oriole
• Oriolidae
• Oriolus
• Oriolus oriolus
• Orion
• orison
• Orissa
• Orites
• Orites excelsa
• Oriya