1. Act of expanding in scope; making more widely available
   "extension of the program to all in need"
    
2. 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"
    
3. Amount, degree or range to which something extends
   "the wire has an extension of 50 feet";
   - prolongation
    
4. An addition to the length of something
   "The extension of the cable allowed it to reach the distant equipment";
   - elongation
    
5. An addition that extends a main building
   "The school built an extension to accommodate the growing number of students";
   - annex, annexe [Brit], wing
    
6. The spreading of something (a belief or practice) into new regions
   "The extension of the empire led to cultural exchanges";
   - propagation
    
7. Act of stretching or straightening out a flexed limb
   "The physical therapist guided the patient through leg extension exercises"
    
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. 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";
   - reference, denotation
    
10. An additional telephone set that is connected to the same telephone line
    "He answered the call on the extension phone in the bedroom";
    - telephone extension, extension phone
     
11. An educational opportunity provided by colleges and universities to people who are not enrolled as regular students
    "The university's extension service offered online courses to working professionals"; "He took several university extension courses to improve his job skills";
    - extension service, university extension
     
12. 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"; "The file name extension '.docx' indicates a Word document";
    - filename extension, file name extension

Derived forms: extensions

Type of: addition, add-on, airing, dance, delay, didactics, dissemination, education, educational activity, enlargement, expansion, hold, improver, instruction, longness, meaning, pedagogy, phone, postponement, property, public exposure, spreading, stretching, string, substance, teaching, telephone, telephone set, time lag, wait

Antonym: flexion

Part of: building, computer file name, computer filename, edifice, file name, filename

Encyclopedia: Extension, Louisiana