define scheme.
noun. verb. The definition of a scheme is a plot or a plan to achieve some action. An example of a scheme is a plot to defraud your boss. To scheme is to plot or plan to do something. An example of scheme is when you and your friend meet to talk about how you are going to get away with skipping school.
Scheme is primarily a functional programming language. It shares many characteristics with other members of the Lisp programming language family. Scheme's very simple syntax is based on s-expressions, parenthesized lists in which a prefix operator is followed by its arguments.