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1 definition found From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]: beta reduction [lambda-calculus] The application of a {lambda abstraction} to an argument expression. A copy of the body of the lambda abstraction is made and occurrences of the {bound variable} being replaced by the argument. E.g. (\ x . x+1) 4 --> 4+1 Beta reduction is the only kind of reduction in the {pure lambda-calculus}. The opposite of beta reduction is {beta abstraction}. These are the two kinds of beta conversion. See also name capture.