<p><strong>Noun</strong></p><ul><li>any general or comprehensive division; a class</li><li>a classificatory division in any field of knowledge, as a phylum or any of its subdivisions in biology</li><li>(in Aristotelian philosophy) any of the fundamental modes of existence, such as substance, quality, and quantity, as determined by analysis of the different possible kinds of predication</li><li>(in Kantian philosophy) any of the fundamental principles of the understanding, as the principle of causation</li><li>any classification of terms that is ultimate and not susceptible to further analysis</li><li>a game in which a key word and a list of categories, as dogs, automobiles, or rivers, are selected, and in which each player writes down a word in each category that begins with each of the letters of the key word</li><li>a type of mathematical object, as a set, group, or metric space, together with a set of mappings from such an object to other objects of the same type</li><li>part of speech</li></ul>