An affix is a morpheme that is attached to a base morpheme such as a root or to a stem, to form a word. Affixes may be derivational, like English -ness and pre-, or inflectional, like English plural -s and past tense -ed.
Infixes are bound morphemes by definition. Prefixes and suffixes may be separable affixes.
There also has been a proposal of a somewhat different type of affix, a disfix or subtractive morpheme, which subtracts phonological segments from bases.
Affixes are central to the process of concatenation.
| affix | example |
|---|---|
| prefix | undo prefix + root |
| suffix | looking root + suffix |
| infix 1 | fanfreakingtastic ro- + infix + -ot |
| circumfix | Kabyle: "bride" (compare to "groom") circumfix + root + circumfix |
| suprafix | produce (noun) produce (verb) (changing stress) |
Lexical affixes are relatively rare. The Wakashan, Salishan, and Chimakuan languages all have lexical suffixes — the presence of these is an areal feature of the Pacific Northwest of the North America.
The lexical suffixes of these languages often show little to no resemblance to free nouns with similar meanings. Compare the lexical suffixes and free nouns of Northern Straits Saanich written in the Saanich orthography and in Americanist notation:
| Lexical Suffix | Noun | ||||
|---|---|---|---|---|---|
| -O, | -aʔ | "person" | ,EL̶TÁLṈEW̱ | ʔəɬtelŋəxʷ | "person" |
| -NÁT | -net | "day" | SC̸IĆEL | skʷičəl | "day" |
| -SEN | -sən | "foot, lower leg" | SXENE, | sx̣ənəʔ | "foot, lower leg" |
| -ÁWTW̱ | -ew̕txʷ | "building, house, campsite" | ,Á,LEṈ | ʔeʔləŋ | "house" |
Lexical suffixes when compared with free nouns often have a more generic or general meaning. For instance, one of these languages may have a lexical suffix that means water in a general sense, but it may not have any noun equivalent referring to water in general and instead have several nouns with a more specific meaning (such "saltwater", "whitewater", etc.). In other cases, the lexical suffixes have become grammaticalized to various degrees.
Some linguists have claimed that these lexical suffixes provide only adverbial or adjectival notions to verbs. Other linguists disagree arguing that they may additionally be syntactic arguments just as free nouns are and thus equating lexical suffixes with incorporated nouns. Gerdts (2003) gives examples of lexical suffixes in the Halkomelem language (the word order here is Verb Subject Object):
In sentence (1), the verb "bathe" is where is the root and and are inflectional suffixes. The subject "the woman" is and the object "the baby" is . In this sentence, "the baby" is a free noun. (The here is an auxiliary, which can be ignored for explanatory purposes.)
In sentence (2), "the/a baby" does not appear as a free noun. Instead it appears as the lexical suffix which is affixed to the verb root (which has changed slightly in pronunciation, but this can also be ignored here). Note how the lexical suffix may be translated as either "the baby" (definite) or "a baby" (indefinite): this change in definiteness is a common change in meaning that happens with incorporated nouns.
Linguistic morphology | Affixes
Аффикс | Affix#Affixe in der klassischen Linguistik | Afijo | Afikso | Affixe | Afixo | Aðskeyti | Affix | 接辞 | Affix | Afiks | Afixo | Affiksi | Affix | Phụ tố | 詞綴