extension

/ɪkˈstɛnʃən/
noun
  1. An extra period of time allowed for something to be completed or paid.
    • The project deadline is Friday, but we can request an extension if needed.
    • I asked the bank for an extension on my loan payment.
    • The teacher gave us a one-week extension on the homework.
  2. A part that is added to something to make it longer, larger, or reach further.
    • The phone has an extension for the camera lens.
    • He attached an extension to the vacuum hose to clean the high corners.
    • We bought a table extension so more people could sit at dinner.
  3. An additional telephone line connected to the main line, often in a different room.
    • The office has an extension in the conference room.
    • Please call me on extension 42 when you arrive.
    • She picked up the extension in the kitchen to join the call.
  4. The act of straightening a limb or body part.
    • Yoga poses often involve the extension of the spine.
    • He did arm extensions with light weights at the gym.
    • The physical therapist recommended leg extensions to strengthen the knee.
  5. A program or service offered by a university or organization to reach people outside its main campus or location.
    • The agricultural extension office helps local farmers with new techniques.
    • She took a photography class through the university extension program.
    • Many adults enroll in extension courses to learn new skills.