A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
- The traditional way of describing the similarities and differences between constituents is to say that they belong to categories'' of various types. Thus, words like ''boy'', ''girl'', ''man'', ''woman'', etc. are traditionally said to belong to the category''' of Nouns, whereas words like ''a'', ''the'', ''this'', and ''that'' are traditionally said to belong to the ' category of Determiners.
- This steep and dangerous climb belongs to the most difficult category .
(mathematics) A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative.
- I wouldn't put this book in the same category as the author's first novel.
- One well-known category has sets as objects and functions as arrows.
- Just as a monoid consists of an underlying set with a binary operation "on top of it" which is closed, associative and with an identity, a category consists of an underlying digraph with an arrow composition operation "on top of it" which is transitively closed, associative, and with an identity at each object. In fact, a category's composition operation, when restricted to a single one of its objects, turns that object's set of arrows (which would all be loops) into a monoid.
* (group to which items are assigned) class, family, genus, group, kingdom, order, phylum, race, tribe, type
* See also
* category mistake
* category theory
* conceptual category
* perceptual category
* (l) (obsolete)
- It was April 22, 1831, and a young man was walking down Whitehall in the direction of Parliament Street.. He halted opposite the Privy Gardens, and, with his face turned skywards, listened until the sound of the Tower guns smote again on the ear and dispelled his doubts .
(ambitransitive) To lack confidence in; to disbelieve, question, or suspect.
- He doubted that was really what you meant.
- Even in matters divine, concerning some things, we may lawfully doubt
(archaic) To fear; to suspect.
* 1819 , Lord Byron, Don Juan , I.186:
- To try your love and make you doubt of mine.
(obsolete) To fear; to be apprehensive of.
* R. of Gloucester
- He fled, like Joseph, leaving it; but there, / I doubt , all likeness ends between the pair.
- Edmond [was a] good man and doubted God.
- I doubt some foul play.
(obsolete) To fill with fear; to affright.
* Beaumont and Fletcher
- I of doubted danger had no fear.
- The virtues of the valiant Caratach / More doubt me than all Britain.