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[U] when you have or own somethingThe possession of large amounts of money does not ensure happiness.
formal I have in my possession a letter which may be of interest to you.
formal He was found in possession of explosives.
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[C usually plural] something that you own or that you are carrying with you at any timePlease remember to take all your personal possessions with you when you leave the aircraft.
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[C usually plural] the countries that are ruled by another countrya former overseas possession
get/take possession of sth legal to start to use and control a building or piece of land, whether you own it or notWe've already bought the house but we won't take possession of it until May.