Second has a number of different meanings:

Angle:

Unit of Angle: The arcsecond or second of arc (symbol: ″)

Unit of Angle: The second of right ascension (symbol: s)

Democracy: A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ...

In relation to democratic procedure:

• To second is to support a proposal.

Duelling and fighting: The Elections and Parties Series Democracy Liberal democracy History of democracy Referenda Representative democracy Representation Voting Voting systems Elections Elections by country Elections by calender Electoral systems Politics Politics by country Political campaigns Political science Political philosophy Related topics Political parties Parties by country Parties by name Parties by ideology... A second is an endorsement by a member of a deliberative body that a proposed motion should be discussed by the body. ...

The second is the agent of the person who submits a challenge to someone who proposes a duel or the agent of the person responds to said challenge.

Education Look up Agent in Wiktionary, the free dictionary An agent is an autonomous entity with an ontological commitment and agenda of its own. ... A duel or duel of honour is a form of armed combat in which two individuals participate. ...

One of two classifications of undergraduate degrees awarded in Great Britain, Republic of Ireland and Hong Kong.

Music: The British undergraduate degree classification system is a grading scheme used to distinguish between the achievements of undergraduate degree holders (such as those gaining bachelors degrees or undergraduate masters degrees) in the United Kingdom. ... In some educational systems, an undergraduate is a post-secondary student pursuing a Bachelors degree. ... This article is about academic degrees. ...

In relation to music the intervals:

• Augmented second
• Major second
• Neutral second
• minor second
• all being linear steps and vertical dissonances (with the possible exception of the augmented second/minor third)

Numbers Wikibooks Wikiversity has more about this subject: School of Music Look up Music in Wiktionary, the free dictionary Wikicities has a wiki about Music: Music Music City : a collaborative music database All Music Guide: includes a comprehensive and flexible Genre and Style system MusicWiki: A Collaborative Music-related encyclopedia Science... In music theory, an interval is the distance in pitch between two notes, the lower and higher members of the interval. ... The musical interval of a minor third is the relationship between the first note (the root or tonic) and the third note in a minor scale. ... The musical interval of a major second — also called a whole-tone — is the relationship between the first note (the root or tonic) and the second note in a major scale (and also a minor scale). ... A neutral second is a musical interval half-way between a minor second and a major second. ... The musical interval of a half step, semitone, or minor second is the relationship between the leading tone and the first note (the root or tonic) in a major scale. ... See also: Dance step, Stairway. ... In poetry, dissonance is the deliberate avoidance of patterns of repeated vowel sounds (see assonance). ... The musical interval of a minor third is the relationship between the first note (the root or tonic) and the third note in a minor scale. ...

The second item or entry is the number 2 entry, following first.

Rock Climbing: For other uses, see number 2. ... Second, or For Inspiration and Recognition of Science and Technology, is an organization founded by inventor Dean Kamen in 1989 in order to develop ways to excite students about engineering and technology. ...

In relation to rock climbing:

• The second is the climber who follows the lead climber.

Time: Climbers on Valkyrie at the Roaches. ...

Unit of time: the second