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• alt
  alt

  adjective

  high.
• alt-
  alt-

  variant of alti- before a vowel.
• alt.
  alt.

  abbreviation

  alteration.

alt

¹ American  

[alt] / ælt /

adjective

1. high.

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noun

1. in alt, in the first octave above the treble staff.

alt- ² American  

1. variant of alti- before a vowel.

   altazimuth.

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alt- ³ American  

1. a combining form of alternative, used in compound words describing a nontraditional or unconventional version within a genre or category, often something provocative, subversive, or innovative: the alt-right movement; writers of alt-lit;

   alt-country bands;

   the alt-right movement;

   alt-weeklies;

   writers of alt-lit;

   quinoa and other alt-grains.

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alt. ⁴ American  

abbreviation

1. alteration.

2. alternate.

3. altitude.

4. alto.

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alt British  

/ ælt /

adjective

1. (esp of vocal music) high in pitch

2. of or relating to the octave commencing with the G above the top line of the treble staff

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noun

1. in the octave directly above the treble staff

Etymology

Origin of alt¹

1525–35; < Provençal < Latin altum, noun use of neuter of altus high

Origin of alt-³

First recorded in 1985–90; from the use of the prefix alt- in Usenet, to denote newsgroups with unconventional discussion topics

Example Sentences

Coachella has its own version of the Enchanted Tiki Room attraction from Disneyland — and it comes from the most unlikely of artists: British alt rockers Radiohead.

From Los Angeles Times • Apr. 13, 2026

Other alt managers aren’t as dependent on their leader.

From Barron's • Mar. 2, 2026

Mark and Dahlia discuss this news, and also how lower court judges are calling out SCOTUS’ unreasoned, incoherent opinions and how some of the Justices are trying to control, alt, delete all the backbiting.

From Slate • Sep. 6, 2025

“We have club comedians, alt comedians, people who came up on TikTok, sketch people, improv people, Black people, queer people — every kind of comedy has a place in the show.”

From Los Angeles Times • Aug. 12, 2025

Some alt rock was blaring from her paint-covered Bose docking system.

From "The Last Olympian" by Rick Riordan