Learner's definition of PURPOSE
1 [count] : the reason why something is done or used : the aim or intention of something
The purpose of the new resort is to attract more tourists.
There's little/no purpose in restarting the process. [=there is little/no reason to start the process again]
These ancient mounds were probably used for ceremonial purposes. [=were probably used in ceremonies]
Please keep a record of your receipts for tax/business purposes. [=for situations involving taxes/business]
Everything on the boat serves a purpose. [=everything has a particular use or function]
The loans are small but they serve a good purpose.
We were happy to know that the money was being used for a good purpose. [=for something useful, important, etc.]
She used her skills to (no) good purpose. [=she used her skills in a way that was (not) good or helpful]
Changes had suddenly been made for no apparent purpose. [=for no clear reason]
For the purpose(s) of this discussion, let's assume that sales will increase next year.
2 [noncount] : the feeling of being determined to do or achieve something
She wrote with purpose. [=she knew exactly what she wanted to write]
Sometimes his life seemed to lack purpose or meaning.
He was a man of purpose. [=he was very clear about what he wanted to do and how to do it]
We started work again with a renewed sense of purpose.
He showed great strength of purpose. [=he showed that he was very determined to achieve his goals]
3 [count] : the aim or goal of a person : what a person is trying to do, become, etc.
She knew from a young age that her sole purpose (in life) was to be a writer. [=she knew that all she wanted (in life) was to be a writer]
We shared a common purpose. [=we had the same goals]
He was searching for a higher purpose. [=a more meaningful reason to live, work, etc.]
for (all) practical purposes
: in a way that is planned or intended : in a deliberate way
to/for all intents and purposes
to the purposeold-fashioned
: appropriate to the situation