A second is base units of time in the International System of Units (SI).
Second, Seconds or 2nd may also refer to:
Music
Notes and intervals
- Augmented second, an interval in classical music
- Diminished second, unison
- Major second, a whole tone
- Minor second, semitone
- Neutral second one-and-a-half semitones
Albums and EPs
- 2nd (The Rasmus EP), 1996
- Second (Baroness EP), 2005
- Second (Raye EP), 2014
- The Second, second studio album by rock band Steppenwolf
- Seconds (The Dogs D'Amour album), released in 2000
- Seconds (Kate Rogers album), released in 2005
- Seconds (Tim Berne album), released in 2007
Songs
- "Second" (Hope D song), 2020
- "Seconds", from The Human League's 1981 album Dare
- "Seconds" (song), from U2's 1983 album War
- "Seconds", from Le Tigre's 2004 album This Island
Film
- The 2nd, an American 2020 film starring Ryan Phillippe
- Seconds (1966 film), a US thriller directed by John Frankenheimer
- Seconds (2014 film), a Malayalam thriller directed by Aneesh Upasana
- "Seconds" (The Batman), an episode in the American animated TV series
- "Seconds", an episode of the American TV series Lois & Clark: The New Adventures of Superman
People
- Albéric Second, a French journalist and writer
- Second-in-command, a deputy commander in British and Commonwealth armies
Science
- 2 (number), as an ordinal (also written as 2nd or 2d)
- Second of arc, an angular measurement unit, 1/3600 of a degree.
- Second of right ascension, in astronomy
Sports, games, and dueling
- Second dealing, a way of cheating in card games
- Second (chess), assistant to a chess player
- Second (curling), delivers the second set of stones in curling;
- Second (duel), the agent of the participant
- Second, the cornerman in combative sports such as boxing
- Second (rock climbing), the climber who follows the lead climber
Other
- Second (parliamentary procedure), to formally support a motion or resolution
- Factory second, a new product sold for a discount because of minor imperfections
- Second hand or used goods, items that have been used before being resold
- Academic degree, second-class degree, divided into upper-second and lower-second, or 2.1 and 2.2, in the British undergraduate degree classification
- Educational stage in North American elementary schools
- Seconds, an interview magazine published from 1987–2000.
- Seconds (comics), a 2014 graphic novel by Bryan Lee O'Malley.
- Seconds (angle), units of angular measurement
- Factory seconds, retail items sold to the public for a reduced rate.
See also
- Secondment, a transfer of an employee, usually within an organization
- Segundo (disambiguation)
- SND (disambiguation)
- Secondary (disambiguation)