Er... I bet you already know but I'll answer the question.It means:Through the agency or means of (indicating how something happens.)There are other definitions of this word though.
A purpose needn't have a meaning as it is a way of obtaining an object. It would be the object that would have or have not a meaning.purpose don't have any meaning as it itself is a meaninganswered...
'MEANING' in other words can be the 'vocabulary' of a word or the 'essence' of the word as to what the word precisely means. OR meaning is the meaning of meaning what you just said meaning