A Criteria (n.) like agreement with a memory image, for picking the right cloth, would itself need a picture of agreement to check against; is any such link necessarily the last?
A Criteria (n.) that another has toothache is a grammatical explanation of the word 'toothache', and so an explanation of its meaning.
A Criteria (n.) is usually told from a symptom only by an ad hoc decision; doctors use disease names without ever deciding, and that is no deplorable lack of clarity.
A Criteria (n.) is what the question how does the chemist know asks for, unlike how a layman knows, which is answered by a chemist told him.
A Criteria (n.) is not finally our determination but part of life, as with pain.
A Criteria (n.) may be lacking as certain even where there is certainty; certainty does not imply certain criteria.
A Criteria (n.) and a symptom keep trading places in our language, and science soothes us by treating the measurable as the proper meaning.