1. A key on a computer keyboard (Alt key) used in combination with other keys to perform commands.
Usage: computing; also called the Alternate key

1. Relating to alternative music, culture, or lifestyle; unconventional or nonmainstream.
Usage: informal; often used in music and fashion contexts

1. Short for alternative; used to describe something different from the standard or mainstream.
Usage: informal; commonly used in computing and music contexts

Examples

• She listens to alt rock and indie bands.
• Press Alt and F4 to close the window.
• The alt fashion scene includes vintage and experimental styles.
• He prefers alt comedy over mainstream stand-up.
• The website offers alt text descriptions for all images.
• Alt music emerged as a reaction to commercial pop in the 1980s.