Look up second in Wiktionary, the free dictionary.

Second may refer to:

• 2 (number), as an ordinal (also written as 2d or 2nd)
• Second, a unit of time
• 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
• Second, the climber who follows the lead climber in rock climbing
• Second, an assistant to a chess player, in areas such as opening preparation and adjournment analysis
• Second-class degree or second-class honours, a British undergraduate degree classification
• Seconds, substandard or second-hand goods
• Seconds, a 1966 film directed by John Frankenheimer and starring Rock Hudson
• Seconds, a song by U2 from their 1983 album, War
• Seconds, an album by Grand Central Records artist Kate Rogers
• Second-in-command, a deputy commander in British and Commonwealth armies
• "Seconds (The Batman)", a fourth-season episode of The Batman

In music:

• 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)
• Augmented second, or either one-and-one-quarter tones (i.e., two-and-a-half semitones) or one-and-one-half tones (i.e., three semitones)

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