1. Being precise with regard to a prescribed or specified criterion
   "his guess was on the nose"
   - on the button

1. Just as it should be
   - precisely, exactly, on the dot, on the button

See also: precise

Encyclopedia: On the nose

• optional
• optionally
• optometrist
• optometry
• opulence
• opulent
• opulently
• Opuntia
• Opuntia cholla
• Opuntia lindheimeri
• Opuntia tuna
• Opuntiales
• opus
• opuscule
• opusculum
• OPV
• opéra bouffe
• or
• OR circuit
• or else
• OR gate
• or so
• ora
• orach
• orache