Second, the climber who follows the lead climber in rock climbing

Second, the agent of a participant in a duel

2 (number), as an ordinal (also written as 2d or 2nd)

Second-class degree or second-class honours, a British undergraduate degree classification

Second, a unit of time

Arcsecond, a unit of angle

Seconds, substandard or second-hand goods

Second of right ascension, in astronomy

Major second, or whole tone (i.e, two semitones)

Second (parliamentary), to support a proposal

Second-in-command, a deputy commander in British and Commonwealth armies

Neutral second, or three-quarters-tone (i.e., one-and-a-half semitones)

Second, an assistant to a chess player, in areas such as opening preparation and adjournment analysis

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

"Seconds (The Batman)", a fourth-season episode of The Batman