1. used to introduce a hypothetical situation; assuming that

Examples

• Supposing it rains tomorrow, we’ll have to cancel the picnic.
• Supposing you had a million dollars, what would you do with it?
• We could finish the project early, supposing everyone works overtime.
• Supposing the train is delayed, how will we get to the meeting on time?
• Supposing she doesn’t show up, we’ll have to start without her.
• The plan will work, supposing we get approval from the board.