Word stem

A word stem is the important part of a word that holds its main meaning. It helps us see how words are made and how they change.

In some languages, like the Athabaskan languages, a verb stem is like a root. It needs extra parts to make a full word. It can also show tone or emphasis.

In many languages, a stem usually stays the same even when a word changes for different grammar rules. But sometimes, the stem changes a little, especially in languages like Polish or English. These changes help show details such as time or tense.

By looking at word stems in different languages, experts have found words that share a common origin. This has helped us learn how languages are related and how they have changed over time.

Root vs stem

The word friendship is made by adding the ending ‑ship to the root word friend. A stem is a base word that we can change in many ways.

For example, the stem for destabilized is de·stabil·ize. This includes the prefix de- and the suffix ‑ize.

A stem can be a simple root, like the verb run. It can also be a combination of roots, like meatball. Or it can be a word with added parts, like blacken. For the verb to wait, the stem is wait. We use this stem in all its different forms such as waits, waited, and waiting.

Main article: Morpheme
Main article: Root word
Main article: Inflected
Main article: Compound
Main article: Derivation
Main article: Verb

Citation forms and bound morphemes

Main article: Lemma (morphology)

In languages like English and Chinese, the basic part of a word, called the stem, is often the same as the word you find in a dictionary. But in some languages, the stem never appears by itself. For example, the English verb "run" looks the same now and later. But the Spanish verb "corr-" is always used with extra letters, like in "correr." You never say "corr-" alone. These parts of words that can't stand alone are called bound morphemes.

In computer studies of language, a stem is the unchanging part of a word, even when we add endings to it. For the word "produced," the basic form is "produce," but the stem is "produc-" because of the form "producing."

Paradigms and suppletion

A list of all the different forms a word can take is called its inflectional paradigm. For example, the adjective "tall" has three forms: tall (positive), taller (comparative), and tallest (superlative). The stem of this adjective is "tall."

Some paradigms use different stems for their forms, which is called suppletion. An example is the adjective "good," whose stem changes from "good" to "bet-." Its forms are: good (positive), better (comparative), and best (superlative).

Main article: suppletion

Oblique stem

In Latin and Greek, some nouns change their stem when they are used in different forms. This special stem is called the oblique stem. It is used in cases other than the nominative and vocative singular.

For example, in Latin and Greek dictionaries, the genitive singular form, which uses the oblique stem, is often listed.

English words that come from Latin or Greek often show this oblique stem. Examples include adipose, altitudinal, android, and mathematics. Over time, these differences developed because of changes in the sounds of the nominative form in these languages.