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catch on to grasp the meaning of something (often fol by "to"). [3 definitions]
catch on fire (informal) to start to burn; catch fire.
catchpenny made cheaply for quick sale. [2 definitions]
catch phrase a phrase that gains wide public currency, esp. by being frequently repeated.
catch someone's eye to get the attention of someone.
catchup a variant of ketchup.
catch up to reach the same distance or level as another or others who are further ahead (usu. fol. by "to" or "with"). [3 definitions]
catch-up any attempt to overtake one who is ahead, as in a game.
catchword a word or phrase repeated until it becomes a slogan.
catchy easily learned, noticed, or remembered. [2 definitions]
catechetical of, like, or consisting of teaching by means of questions and answers, as in a catechism.
catechism a summary of the principles of a religion, esp. Christianity, in the form of questions and answers. [2 definitions]
catechist one who teaches by means of a catechism, esp. one who instructs another in the principles of Christianity prior to confirmation or baptism.
catechize to teach (someone) by a question and answer method, esp. religious principles. [2 definitions]
catecholamine any of a group of amines, such as epinephrine, norepinephrine, and dopamine, that may act as hormones or neurotransmitters.
catechu any of several water-soluble astringent substances obtained from various tropical plants of southeast Asia such as the acacia, used in medicine, tanning, and dyeing.
catechumen a person being taught the basic principles of Christianity, such as a convert prior to baptism. [2 definitions]
categorical with no exceptions or conditions; absolute. [2 definitions]
categorical imperative the claims of personal conscience in respect to a particular ethical choice.
categorize to put into groups that have common characteristics; arrange by categories; classify. [2 definitions]
category a specific class or group in a classification system.