till - definition and synonyms

conjunction, preposition 

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Till can be used in the following ways:
as a preposition (followed by a noun): I won’t be back till late.
as a conjunction (connecting two clauses): James lived with his parents till he was twenty-five.
  1. until: ‘Till’ is less formal than ‘until’ and is used less often in writing

    You’ll have to wait till tomorrow.

    Just sit here till I come back.