I suspect that you are confusing “meaning” with “definition.”
In my dictionary the words **meaning **and **purpose **are practically synonymous.
mean•ing
noun \ˈmē-niŋ\
: the idea that is represented by a word, phrase, etc.
: the idea that a person wants to express by using words, signs, etc.
: the idea that is expressed in a work of writing, art, etc.
Full Definition of MEANING
1
a : the thing one intends to convey especially by language : PURPORT
b : the thing that is conveyed especially by language : IMPORT
2
: something meant or intended : AIM
3
: significant quality; especially : implication of a hidden or special significance
4
a : the logical connotation of a word or phrase
b : the logical denotation or extension of a word or phrase
merriam-webster.com/dictionary/meaning
1pur•pose
noun \ˈpər-pəs\
: the reason why something is done or used : the aim or intention of something
: the feeling of being determined to do or achieve something
: the aim or goal of a person : what a person is trying to do, become, etc.
merriam-webster.com/dictionary/purpose?show=0&t=1413832749