It's possible that the term is being used informally or creatively to describe a word or concept that is:
* The opposite of an antonym: For example, if "hot" is the antonym of "cold", an "antiantonym" might be a word that is neither hot nor cold, like "tepid". However, this is a stretch of the concept of antonyms.
* A word that has a complex or nuanced relationship to an antonym: This might involve a word that shares some characteristics with an antonym but differs in other ways. For example, "warm" could be considered an "antiantonym" of "cold" because it is neither hot nor cold, but it is also closer in meaning to "hot" than "cold".
In general, it's best to avoid using the term "antiantonym" unless you are in a specific context where it has a clearly defined meaning. It is more accurate and less confusing to use the standard linguistic terms for describing word relationships, such as:
* Antonyms: Words with opposite meanings (e.g., hot/cold, up/down).
* Synonyms: Words with similar meanings (e.g., happy/joyful, big/large).
* Hyponyms: Words that are more specific than another word (e.g., dog is a hyponym of animal).
* Hypernyms: Words that are more general than another word (e.g., animal is a hypernym of dog).
Let me know if you have any further questions!