Definition

Noun: A bound morpheme is a meaningful linguistic unit that cannot stand alone as an independent word. It must be attached to a free morpheme (a word that can stand alone) or another bound morpheme to form a word and convey meaning.

Usage

A bound morpheme is used to create new words or modify the grammatical function of existing words. It is always found as part of a larger word construction.

Examples

• The plural suffix -s in "cats" is a bound morpheme. It cannot be used by itself.
• The past tense suffix -ed in "walked" is a bound morpheme.
• The prefix un- in "unhappy" is a bound morpheme.
• The suffix -ness in "happiness" is a bound morpheme.

Advanced Usage

• Inflectional vs. Derivational: Bound morphemes can be categorized. Inflectional bound morphemes (like -s, -ed, -ing) change a word's form to indicate grammatical properties (tense, number, case) but do not create new words or change the core meaning. Derivational bound morphemes (like un-, -ness, -able) often change a word's part of speech or core meaning to create a new word (e.g., "happy" [adjective] + -ness = "happiness" [noun]).
• Allomorphs: A single bound morpheme can have different phonetic forms, called allomorphs. For example, the plural morpheme -s is realized as /s/ in "cats," /z/ in "dogs," and /ɪz/ in "dishes."

Variants and Related Words

• Free Morpheme (n): The opposite of a bound morpheme. A morpheme that can function as a standalone word (e.g., "cat," "walk," "happy").
• Affix (n): A general term for a bound morpheme that is attached to a base word. Prefixes (attached to the front) and suffixes (attached to the end) are types of affixes.
• Cranberry Morpheme (n): A type of bound morpheme that has no independent meaning and does not recur in a recognizable pattern in the language (e.g., the "cran-" in "cranberry").

Synonyms

• Affix (when referring to prefixes and suffixes specifically)
• Grammatical morpheme (often used for inflectional bound morphemes)

Related Concepts

• Morphology: The study of the structure and formation of words, including the analysis of morphemes.
• Base/Root: The core free or bound morpheme that carries the principal meaning of a word, to which affixes are attached (e.g., "view" in "review," "preview").

Noun

1. a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns