 If thought is a kind of language, we can raise the question whether it is compositional. Thought would not have to be much like Swahili or the language of set theory for the question to make sense, but we do need the assumptions that thoughts have meanings (and so, presumably, are not themselves meanings) and that they have meaningful constituents. These assumptions follow from  the language of thought hypothesis  (see entry). Those who reject this hypothesis may still speak of the compositionality of thought—but only in an extended sense.