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Definition of cap noun from the Oxford Advanced American Dictionary

      

    cap

     noun
    noun
    NAmE//kæp//
     
     
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    hat
  1. 1a type of soft flat hat with a bill (= a hard curved part sticking out in front) a baseball cap
  2. 2(usually in compounds) a soft hat that fits closely and is worn for a particular purpose a shower cap see mob cap, stocking cap
  3. 3a soft hat with a square flat top worn by some college or university teachers, and students at special ceremonies The photo showed her wearing a graduation cap and gown. compare mortarboard
  4. on pen/bottle
  5. 4a cover or top for a pen, bottle, etc. a lens cap see also gas cap, hubcap Thesauruslid
    • top
    • cork
    • cap
    • plug
    These are all words for a cover for a container.
    • lid a cover over a container that can be removed or opened by twisting or lifting it off:a jar with a tight-fitting lid
    • top a thing that you put over the end of something such as a pen or bottle in order to close it
    • cork a small round object made of cork or plastic that is used for closing bottles, especially wine bottles
    • cap (often in compounds) a top for something such as a bottle, or a protective cover for something such as the lens of a camera
    • plug a round piece of material that you put into a hole in order to block it; a flat round rubber or plastic thing that you put into the hole of a sink in order to stop the water from flowing out:a drain plug
    Patterns
    • a tight-fitting lid/top/cap
    • a screw top/cap
    • a pen lid/top
    • to put on/screw on/take off/unscrew the lid/top/cap
    • to pull out the cork/plug
  6. on tooth
  7. 5an artificial covering on a tooth that makes it look more attractive
  8. limit on money
  9. 6an upper limit on an amount of money that can be spent or borrowed by a particular institution or in a particular situation The government has placed a cap on military spending.
  10. in toy guns
  11. 7a small paper container with explosive powder inside it, used especially in toy guns see caps, ice cap, thinking cap
  12. Thesauruslid
    • top
    • cork
    • cap
    • plug
    These are all words for a cover for a container.
    • lid a cover over a container that can be removed or opened by twisting or lifting it off:a jar with a tight-fitting lid
    • top a thing that you put over the end of something such as a pen or bottle in order to close it
    • cork a small round object made of cork or plastic that is used for closing bottles, especially wine bottles
    • cap (often in compounds) a top for something such as a bottle, or a protective cover for something such as the lens of a camera
    • plug a round piece of material that you put into a hole in order to block it; a flat round rubber or plastic thing that you put into the hole of a sink in order to stop the water from flowing out:a drain plug
    Patterns
    • a tight-fitting lid/top/cap
    • a screw top/cap
    • a pen lid/top
    • to put on/screw on/take off/unscrew the lid/top/cap
    • to pull out the cork/plug
    Idioms
    a feather in your cap
     
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    an action that you can be proud of This idiom comes from the Native American custom of giving a feather to someone who had been very brave in battle.
See cap in the Oxford Advanced Learner's Dictionary