A program construct that is evaluated to obtain a value, potentially with side effects or failure. An arithmetic mathematical expression is one example; its abstract syntax tree records how operands and operations nest.
The syntactic priority that resolves grouping when different operators occur together without parentheses. It determines the abstract syntax tree shape before evaluation.
The syntactic grouping convention for successive operators of the same precedence. Left grouping of subtraction makes a-b-c mean (a-b)-c; it does not make subtraction an associative operation.

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