extension.

1. An addition that increases length, area, time, or available scope.

2. A telephone connection reached through a larger shared system.

3. The set of things to which a word or concept applies.

Use it for

Words that belong together

• deadline extension
• building extension

On the page

The deadline extension allowed the archive search to be completed.

Usage notes

Primary category: academic / formal. Forms: Singular extension; plural extensions. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: analysis, explanation, qualification. Commonness: moderately common.