› [C] the reason for doing something or the reason that something exists: sb's purpose in doing sth My purpose in calling this meeting was to remind everyone of some basic rules.with/for the purpose of (doing) sth He learnt Chinese for the express purpose of starting a business there. I went to the conference with the sole purpose of advertising our services.for tax/business/insurance purposes He pays himself a small salary for tax purposes. I can see no useful purpose in speaking to him again. You need to assure shareholders that their investment is being used to good purpose.
on purpose › intentionally, not by accident: I know you didn't delete the database on purpose, but please be more careful.
serve a purpose › to have a use: These small village shops serve a very useful purpose.
be to no purpose › to be completely unsuccessful: All my efforts were to no purpose.