// n. The requirement, adopted in some versions of the X-bar system, that every non-head daughter in a rule must be a maximal projection. Maximality is widely, though not universally, espoused by X-bar theorists; in principle, it is a very attractive...

In mathematics, especially in order theory, a maximal element of a subset S of some partially ordered set is an element of S that is not smaller than any other element in S. The term minimal element is defined...