1. Presumed to be true, but without proof
    Jesus is the supposed son of God.
  2. Generally considered or expected.
    ''The movie is supposed to be good.
  3. Having an obligation.
    You are not supposed to smoke in the restaurant. this means, you are obliged not to smoke.
    The phone is supposed to come with a manual.
  4. Intended.
    The phone is supposed to save us time.

The above text is a snippet from Wiktionary: supposed
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