| catechesis | (noun) oral religious instruction (as before baptism or confirmation) | - |
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| catechin | (noun) a tannic acid that is extracted from black catechu as a white crystalline substance | - |
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| catechism | (noun) an elementary book summarizing the principles of a Christian religion; written as questions and answers | - |
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| (noun) a series of questions put to an individual (such as a political candidate) to elicit their views | - |
| catechist | (noun) one who instructs catechumens in preparation for baptism (especially one using a catechism) | - |
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| catecholamine | (noun) any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland | - |
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| catechu | (noun) East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechu | Synonyms: Acacia catechu, Jerusalem thorn |
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| (noun) extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails; formerly used medicinally | Synonyms: black catechu |
| catechumen | (noun) a new convert being taught the principles of Christianity by a catechist | Synonyms: neophyte |
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| categorem | (noun) a categorematic expression; a term capable of standing alone as the subject or predicate of a logical proposition | Synonyms: categoreme |
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| categoreme | (noun) a categorematic expression; a term capable of standing alone as the subject or predicate of a logical proposition | Synonyms: categorem |
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| categorisation | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorization, classification, compartmentalisation, compartmentalization |
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| (noun) the basic cognitive process of arranging into classes or categories | Synonyms: categorization, classification, sorting |
| (noun) a group of people or things arranged by class or category | Synonyms: categorization, classification |
| categorization | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, classification, compartmentalisation, compartmentalization |
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| (noun) the basic cognitive process of arranging into classes or categories | Synonyms: categorisation, classification, sorting |
| (noun) a group of people or things arranged by class or category | Synonyms: categorisation, classification |
| category | (noun) a general concept that marks divisions or coordinations in a conceptual scheme | - |
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| (noun) a collection of things sharing a common attribute | Synonyms: class, family |
| catena | (noun) a chain of connected ideas or passages or objects so arranged that each member is closely related to the preceding and following members (especially a series of patristic comments elucidating Christian dogma) | - |
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| catenary | (noun) the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points | - |
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| caterer | (noun) someone who provides food and service (as for a party) | - |
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| catering | (noun) providing food and services | - |
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| caterpillar | (noun) a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth | - |
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| caterwaul | (noun) the yowling sound made by a cat in heat | - |
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