Glossary of Linguistic and Etymological Terms

Cognate

Definition: A cognate is a word in one language that descends from the same ancestral word as a word in another language. Cognates are related by history, not simply by similar spelling or meaning.

Worked example: English father and Sanskrit pitṛ́ are commonly identified as cognates. Both continue an inherited Indo-European kinship term, reconstructed as Proto-Indo-European *ph₂tēr. Their relationship is supported by regular correspondences across a larger body of vocabulary and sound patterns—not by the single resemblance alone.

Why it matters: A shared ancestor does not mean one modern language borrowed the word from the other. English and Sanskrit belong to different branches of the Indo-European family; the proposed connection lies much further back.

Borrowing

Definition: Borrowing is the adoption of a word or other linguistic feature from one language into another. A borrowed word is a loanword, even though it is usually not returned to its source.

Worked example: English beef entered through Anglo-French or Old French forms such as boef, ultimately from Latin bōs, “ox” or “cow.” The Latin accusative bovem helps explain the route into Romance forms. The English word is therefore not an inherited English cognate of Latin bōs; it arrived through contact, after French-speaking elites brought extensive French vocabulary into England following the Norman Conquest of 1066.

The meaning also narrowed and shifted in use. English beef came to refer especially to the meat, while cow remained the common name for the living animal. This contrast is often connected with the social history of medieval England: French-derived terms became prominent in culinary and administrative settings, while many everyday animal names remained Germanic. The history is more layered than a one-word, one-date explanation suggests.

Loanword

Definition: A loanword is a word adopted from another language and used as part of the borrowing language’s vocabulary. Its pronunciation, spelling, or grammar may change after adoption.

Worked example: English piano comes from Italian piano, short for pianoforte, a name referring to the instrument’s capacity for soft and loud playing. The word entered English in the eighteenth century, as the instrument and its Italian musical terminology circulated beyond Italy. The spelling stayed recognizably Italian, while English speakers incorporated the word into English pronunciation and use.

Not every borrowed word remains visibly foreign. Over time, a loanword may acquire ordinary plural forms, new meanings, or a pronunciation that no longer resembles its source closely.

Etymon

Definition: An etymon is an earlier form from which a later word derives. The term can refer to a form in an immediate source language or to a reconstructed ancestor further back.

Worked example: Old French boef is an important etymon in the history of English beef; Latin bōs is an earlier source in the chain. An etymology may name several etymons because a word can travel through more than one language before reaching its present form.

Morpheme

Definition: A morpheme is a minimal unit that carries meaning or grammatical function. Some morphemes can stand alone; others must attach to another form.

Worked example: In unhelpful, help is a free morpheme, while un- and -ful are bound morphemes. The word can be analyzed as a combination of meaningful parts, though its history must still be established separately: breaking a word into apparent pieces does not prove how it originated.

Root

Definition: A root is the central lexical element that carries a word’s basic meaning. In historical linguistics, a root may be reconstructed even when no language preserves it in precisely that form.

Worked example: English rewrite contains the root write, with the prefix re- adding the sense “again.” In a historical comparison, a reconstructed root is marked with an asterisk to show that it is not directly attested. The asterisk in Proto-Indo-European forms such as *ph₂tēr signals reconstruction, not uncertainty about whether the form appears in a surviving inscription.

Affix

Definition: An affix is a bound morpheme attached to a root or stem. A prefix appears before the base; a suffix follows it. Other languages also use infixes or circumfixes.

Worked example: In English kindness, the suffix -ness turns the adjective kind into a noun. In unkind, the prefix un- reverses or negates the base meaning. The visible pieces reveal a word’s structure, while historical evidence is needed to establish when each formation entered use.

Derivation

Definition: Derivation forms a new lexeme by adding an affix or otherwise changing a base. It can change meaning and sometimes the word’s grammatical category.

Worked example: English teach is a verb; adding the suffix -er produces teacher, a noun for a person who teaches. This is a derivational relationship. It differs from simply changing a word to fit a sentence, as in teach to teaches.

Inflection

Definition: Inflection marks grammatical information—such as number, tense, or agreement—without generally creating a new dictionary headword.

Worked example: The forms walk, walks, and walked belong to the same lexeme, with inflection showing grammatical differences. Compare derivational walker, which names a person or device and functions as a separate lexeme.

Stem

Definition: A stem is the form to which inflectional endings attach. Depending on the language and analysis, a stem may consist of a root alone or a root combined with derivational material.

Worked example: In English walked, walk is the stem and -ed marks past tense. In a form such as walkers, the stem for plural marking is walker, itself built from walk plus the derivational suffix -er.

Semantic change

Definition: Semantic change is a shift in a word’s meaning over time. A meaning may broaden, narrow, become figurative, or acquire a more positive or negative association.

Worked example: English meat once had the broader sense “food” and later came to refer chiefly to animal flesh as food. This is a case of semantic narrowing: the word’s range became more restricted. To describe such a change responsibly, researchers compare dated examples in historical texts rather than assuming that a modern definition was always in use.

Broadening

Definition: Broadening occurs when a word comes to apply to a wider range of meanings or referents than it did earlier.

Worked example: English holiday developed from Old English hāligdæg, literally “holy day.” Its modern uses include public breaks and time away from work, whether or not the occasion is religious. The shift widened the contexts in which the word could be used.

Narrowing

Definition: Narrowing is the opposite process: a word’s meaning becomes more limited than an earlier, broader sense.

Worked example: The history of meat illustrates narrowing from a general term for food to a more specific one. The change did not happen by decree; repeated patterns of use gradually made one sense more prominent than others.

Sound change

Definition: Sound change is a regular alteration in pronunciation across a language or language variety. It is a central tool in historical linguistics because recurring correspondences can reveal relationships obscured by modern spellings.

Worked example: English father and Latin pater differ in their initial consonants, but the contrast fits broader historical patterns among Indo-European languages. One pair alone is not enough to establish a law; linguists test correspondences across many words and account for the conditions in which sounds changed.

Reconstruction

Definition: Reconstruction is the inference of an unattested ancestral form from systematic comparisons among related languages. Reconstructed forms are conventionally marked with an asterisk.

Worked example: Proto-Indo-European had no surviving writing system that records *ph₂tēr directly. The form is reconstructed by comparing descendants in languages such as English, Greek, and Sanskrit, and by applying established sound correspondences. A reconstruction is a scholarly model constrained by evidence, not a claim to have found a lost manuscript.

Calque

Definition: A calque, or loan translation, is a word or expression created by translating the parts of a foreign model rather than borrowing its sound form.

Worked example: English worldview is often discussed as a translation equivalent of German Weltanschauung: both combine elements corresponding to “world” and “view” or “contemplation.” Unlike a straightforward loanword, a calque is built from native material. Its identification depends on historical evidence of the model and translation relationship, not just a matching structure.

Folk etymology

Definition: Folk etymology is a change in a word’s form or interpretation caused by speakers associating an unfamiliar element with a more familiar word or pattern. It is a real linguistic process, not simply a fanciful explanation.

Worked example: English hamburger was associated with ham, even though the food name derives from Hamburg, Germany, and did not originally mean a burger made from ham. The association helped support shortened forms such as burger, which then became productive in names for other foods. This is a case where a mistaken segmentation can still shape later word formation.

Reanalysis

Definition: Reanalysis occurs when speakers assign a different structural interpretation to a familiar form, often without changing its pronunciation at first. Reanalysis can create the conditions for later change.

Worked example: The history of hamburger shows how speakers could reinterpret part of a word as the familiar element ham, then treat burger as a separable unit. Reanalysis is related to folk etymology, but the terms emphasize different aspects: the former focuses on a changed grammatical or structural analysis; the latter often highlights familiar associations that reshape a word.

False friend

Definition: A false friend is a word in one language that resembles a word in another but differs substantially in meaning. Some are historically related; others are coincidental lookalikes.

Worked example: English actual and Spanish actual are related forms, but Spanish actual commonly means “current” or “present-day.” Their shared history does not guarantee identical modern meanings. A false friend is therefore a warning about translation, not proof that two words have unrelated origins.

Back-formation

Definition: Back-formation creates a new, usually shorter word by removing what speakers interpret as an affix from a longer word.

Worked example: English edit was formed from editor, which entered English earlier. Speakers treated the ending of editor as though it were an agent suffix attached to a verb, then formed the verb edit. The apparent direction of formation can therefore run opposite to what a modern speaker might expect.