extension meaning and definition

EXTENSION noun

Definition of extension (noun)

1. a mutually agreed delay in the date set for the completion of a job or payment of a debt
   • "they applied for an extension of the loan"
2. act of expanding in scope; making more widely available
   • "extension of the program to all in need"
3. the spreading of something (a belief or practice) into new regions
   • synonyms: propagation
4. an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
   • synonyms: extension service, university extension
5. act of stretching or straightening out a flexed limb
   • antonym: flexion
6. a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
   • "most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS"
   • synonyms: file name extension, filename extension
7. the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
   • "the extension of `satellite of Mars' is the set containing only Demos and Phobos"
   • synonyms: denotation, reference
8. the ability to raise the working leg high in the air
   • "the dancer was praised for her uncanny extension"; "good extension comes from a combination of training and native ability"
9. amount or degree or range to which something extends
   • "the wire has an extension of 50 feet"
   • synonyms: lengthiness, prolongation
10. an additional telephone set that is connected to the same telephone line
    • synonyms: extension phone, telephone extension
11. an addition to the length of something
    • synonyms: elongation
12. an addition that extends a main building
    • synonyms: annex, annexe, wing