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1.
The high male singing voice in opera, choir, and music in general, with a singing range from C3 (an octave below middle C) to C5 (a man's high C) an octave above.

Situated between the contralto and baritone, the tenor usually plays the male lead in opera and musical theater, usually a young romantic hero.

Many pop singers are tenors, although the vocal subcategories used in opera are not applied to them. Examples include Justin Timberlake, Clay Aiken, Adam Lambert, Matthew Morrison, Darren Criss, Chord Overstreet, Freddy Mercury, Steven Tyler, and Adam Pascal.
According to vocal weight/voice type and range, tenors are usually divided into five different categories:

countertenor: has the same singing as speaking voice as a regular tenor, but his natural range is in the alto (or even soprano) register.

Leggiero ("light") tenor: flexible voice with a very high range, he's a vocal acrobat.

Lyric tenor: A strong, sweet, lightweight voice usually reserved for the boy next door and other vulnerable, naive charcters. Examples include Roberto Alagna and Luciano Pavarotti.

Spinto tenor: A lyric voice with a strong dramatic edge, a bridge between lyric and dramatic. Examples include Placido Domingo and Mario Lanza.

Dramatic tenor: A powerful, emotive, edgy voice which is suited to bold, tragic heroes. Examples include Mario del Monaco and Jose Cura
by Lorelili July 05, 2011
 
2.
The highest male singing voice. Usually plays the hero, the lover in opera or musical plays. They get all of the best pieces written for the male voice.

The countertenor has the normal range, speaking and singing, as a regular tenor, but is capable of singing in the contralto, mezzo-soprano, and, sometimes, even soprano ranges. They use falsetto, rather than their lower range, when singing.

The lyric tenor is the lighter, sweeter sounding, while the dramatic tenor has a stronger, richer, more heroic voice.
There's the Heldentenor, and he looks interested in the dramatic soprano, all decked out in her brass chestplate and horned helmet.
by Sam October 27, 2004
 
3.
The Higher masculine voicing in choral music. Just above the Baritone. It may be divided into two classifications: Tenor and Countertenor; Countertenor being the highest voicing. Other genres of tenors include the Heldentener and the Lyrical Tenor.
The tenors sang the fifth in the chord at the end of the movement.
by E.J. March 29, 2004
 
4.
The highest male register in standard music. In four part music, Tenor is the second to the lowest part in the music, above Baritone/Bass and below the female register of Alto in four part music.
Luciano Pavarotti is a very well known tenor.
by Anthony Boynton May 25, 2008
 
5.
The period of validity or continuity of a given arrangement, situation, undertaking or obligation.
The tenor of a loan, bill or draft; the tenor of his work with the company, the tenor of his employment before retirement
by Hassan (wordforword) October 09, 2006
 
6.
A faggot often found on irc.
Wow that guy acts alot like tenor
by HawksNest November 21, 2004