no (EN)
particle, determiner, adverb, noun

particle “no”

no
  1. expression of disagreement or rejection
    Can I borrow your phone? No, I'm using it right now.
  2. confirmation of a negative statement or question
    Haven't we met before?" "No, I don't think so.

determiner “no”

no
  1. zero amount or not even a single one
    There were no survivors in the accident.
  2. very little or almost none
    He is very skilled, so he can do it in no time.
  3. not allowed (e.g. "no smoking")
    No smoking on the train, please!
  4. not really a (followed by a noun)
    That car is no luxury vehicle, but it gets the job done.

adverb “no”

no
  1. not, not at all (with following adjective)
    This puzzle is no easier than the last one we did.

noun “no”

sg. no, pl. nos or uncountable
  1. a word indicating disagreement or refusal
    When asked if he had taken the money, his no was firm and unwavering.