B1[C]why you do something or why something exists: The purpose of the research is to try and find out more about the causes of the disease.His only purpose in life seems to be to enjoy himself.Her main/primary purpose in suing the newspaper for libel was to clear her name.I came to Brighton for/with the express purpose of seeing you.Letters whose sole purpose is to make a political point will not be published.She had the operation entirely for cosmetic purposes.a multi-purpose kitchen knifeI can see no useful purpose in continuing this conversation.All my efforts were to no purpose (= failed).He gave her a sum of money which she used to good purpose (= well).Goals and purposeson purposeB1If you do something on purpose, you do it intentionally, not by accident: I didn't do it on purpose - it was an accident.Planning, expecting and arrangingPlotting and trappingC2[U]determination or a feeling of having a reason for what you do: I've always admired her for her strength of purpose.Parenthood would give him a sense of purpose.Strength of will and determination›[C]a need: We haven't yet managed to find new premises that are suitable for our purposes.The fabric I bought isn't exactly what I wanted, but it will serve my purposes (= fulfil my needs).Goals and purposesserve a purposeC2to have a use: These small village shops serve a very useful purpose.Performing a functionFunctioning