What is a stem?

Definition
	A stem is the root or roots of a word, together with any derivational affixes, to which inflectional affixes are added.

Discussion
	A stem consists minimally of a root, but may be analyzable into a root plus derivational morphemes. A stem may require an inflectional operation (often involving a prefix or suffix) in order to ground it into discourse and make it a fully understandable word. If a stem does not occur by itself in a meaningful way in a language, it is referred to as a bound morpheme.

Examples (English)
	The verbs tie and untie are both stems. The inflectional third person singular suffix -s may be added to the stems to form ties and unties.

Generic
	A stem is a kind of
	What is a construction? What is a morpheme type?