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a formal description of a language in terms of vocabulary and rules for writing phrases and sentences.
an order of processing a tree in which the parent node is processed in between it's children.
O(n), a problem whose solution requires a linear amount of time or space if the problem is size n.
a runtime error that occurs when an operation such as a method call is attempted on a null pointer.
O(n^2), a problem whose solution requires a quadratic amount of time or space if the problem is of size n.
a data structure representing a series of items, which are removed in the same order they were inserted.
a condition of the input data where the data will be handled by calls to the same program.
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