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Phr V base upon bases, basing, based base sth on/upon sth if you base something on particular facts or ideas, you use those facts or ideas to develop that thingusually passiveThe film is based on a short story by Thomas Mann.Their predictions were based on a survey of 19 local companies.
! Base upon is more formal than base on and is mostly used in writing.
base sth on/upon sth to use facts, ideas, written material etc that you already have in order to decide or produce something: I based my decision on what I thought would be best for the children. The movie was based on a novel by Sinclair Lewis. The results, based on replies from over 10,000 schoolchildren, showed that 30% of them smoked on a regular basis.
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