1. Taking place by degrees
   - gradatory, graduated

See also: gradation, gradual

• os pisiforme
• os pubis
• os scaphoideum
• os sesamoideum
• os sphenoidale
• os tarsi fibulare
• os temporale
• os trapezium
• os trapezoideum
• os triquetrum
• os zygomaticum
• Osage
• osage orange
• Osage River
• Osaka
• Osaka Bay
• Osama bin Laden
• Osasco
• Osborne
• Oscan
• Oscan-speaking
• Oscar
• Oscar Fingal O'Flahertie Wills Wilde
• Oscar Hammerstein
• Oscar Hammerstein II