Second (disambiguation)

Second stands for:

• a unit for time; See: Second
• Two is the second positive whole number.
• Arcsecond, a unit of angle
• Second of right ascension, in astronomy
• Second (parliamentary procedure), to support a proposal
• Second, the agent of a participant in a duel or a cornerman in combative sports such as boxing

Music

• Diminished second, or unison
• Minor second, or semitone
• Neutral second, or three-quarters-tone (i.e., one-and-a-half semitones)
• Major second, or whole tone (i.e., two semitones)