There are undefined concepts as well.
Perhaps this example helps.
Other than mathematics, a million dollars, is a combination of concepts
a large ‘worth’ or sum.
That’s one defined concept in there
dollars meaning the concept of money
also well defined and in there
This is a not so clearly defined concept also, in there within the words of ‘leave it up to listener’s imagination’
all these defined and undefined concepts are amplified in the correct measure naturally by a person speaking it.
so it will have different meanings when spoken by different people.
the meaning would be a different measure of the same concepts that make it up.
(there are a lot of other concepts that make it up of course, just used some as and example)