Before revision: Cognitive synonymy is a property of words or terms distinguished by similarity of mental associations, connotations, emotive responses, and poetic value ; it is the information that a word or term expresses such that it is synonymous with a different word's cognitive meaning (as opposed to emotion or mental association elicited).
After revision: Cognitive synonymy is a type of synonymy in which synonyms are so similar in meaning that they cannot be differentiated either denotatively or connotatively, that is, even by mental associations, connotations, emotive responses, and poetic value ; it is the information that a word or term expresses such that it is synonymous with a different word's cognitive meaning (as opposed to emotion or mental association elicited).