Morpheme and Word

The morpheme is the smallest unit of language that carries meaning or grammatical function, and the word is the basic unit of the lexicon and of syntax; defining both precisely is a foundational problem of morphology.

Definition

A morpheme is the minimal linguistic sign pairing a form with a meaning or grammatical function; a word is a free-standing unit that is the smallest element able to occur in isolation and to be moved or replaced as a whole in syntax.

Scope

This topic covers the definition and identification of morphemes and words, including the classification of morphemes as free or bound and as roots or affixes, the distinction between lexeme and word form, and the criteria (phonological, grammatical, orthographic) used to delimit the word. It does not cover the variation of morphemes into allomorphs or the typological scale along which languages differ, which are treated in sibling topics.

Core questions

• How are morphemes identified and segmented within a word?
• What distinguishes free morphemes from bound morphemes, and roots from affixes?
• What criteria define the word, and why do they sometimes conflict?
• How does the abstract lexeme relate to its concrete word forms?

Key concepts

• free versus bound morpheme
• root, stem, and affix
• lexeme versus word form
• phonological word versus grammatical word
• morph and morpheme

Key theories

The sign-based morpheme

The structuralist conception, due to Bloomfield, of the morpheme as the smallest recurrent form associated with a constant meaning, identified by comparing partially similar forms across the lexicon.

Cross-linguistic criteria for wordhood

The view that 'word' is not a single primitive but a cluster of phonological and grammatical properties that may or may not converge, so wordhood must be established language by language.

History

The morpheme as the minimal meaningful unit was central to American structuralism, with Bloomfield (1933) giving it canonical form. Difficulties with fusional and zero forms led Matthews (1991) and others to question whether the morpheme is the right primitive. Dixon and Aikhenvald (2002) assembled cross-linguistic evidence that wordhood is a graded, multi-criterial notion rather than a universal given.

Debates

Is the morpheme a necessary primitive?

Whether morphemes are the basic building blocks of words or merely descriptive artefacts, given forms where meaning cannot be cleanly localised to a segmentable piece.

Key figures

• Leonard Bloomfield
• Peter H. Matthews
• R. M. W. Dixon
• Alexandra Y. Aikhenvald

Seminal works

• bloomfield1933
• matthews1991
• dixonaikhenvald2002

Frequently asked questions

Are 'cranberry' morphemes real morphemes?

Forms like the 'cran-' of 'cranberry' recur in only one word and carry no independent meaning. They are often called cranberry morphemes and are a classic problem case for the idea that every morpheme has a stable meaning.

Is a contraction like 'don't' one word or two?

It depends on the criterion. Orthographically and phonologically 'don't' behaves as a single word, but grammatically it contains two elements, 'do' and the negator. Such mismatches show that wordhood is multi-criterial.