Affix

In linguistics, an affix is a morpheme that is attached to a word stem to form a new word or word form. The main two categories are derivational and inflectional affixes. Derivational affixes, such as un-, -ation, anti-, pre- etc., introduce a semantic change to the word they are attached to. Inflectional affixes introduce a syntactic change, such as singular into plural, or present simple tense into present continuous or past tense by adding -ing, -ed to an English word. All of them are bound morphemes by definition; prefixes and suffixes may be separable affixes.

Affixes, infixes and their variations

Changing a word by adding a morpheme at its beginning is called prefixation, in the middle is called infixation, and at the end is called suffixation.

Affix	Example	Schema	Description
Prefix/'superfix	un-do	prefix-stem	Appears before the stem
Prefixoid/semi-prefix/pseudo-prefix	flexi-cover	prefixoid-stem	Appears before the stem, but is only partially bound to it
Suffix/postfix	look-ing	stem-suffix	Appears after the stem
Suffixoid/semi-suffix/pseudo-suffix	cat-like	stem-suffixoid	Appears after the stem, but is only partially bound to it
Infix	educated	stem	Appears within a stem — common e.g. in Austronesian languages
Circumfix	enen	circumfixcircumfix	One portion appears before the stem, the other after
Interfix	speed-o-meter	stem_a-interfix-stem_b	Links two stems together in a compound
Duplifix	money~shmoney	stem~duplifix	Incorporates a reduplicated portion of a stem
Transfix	Maltese: ktb "he wrote"	stem	A discontinuous affix that interleaves within a discontinuous stem
Simulfix	mouse → mice	stem\simulfix	Changes a segment of a stem
Suprafix	produce produce	stem\suprafix	Changes a suprasegmental feature of a stem
Disfix'	Alabama: tipli "break up"	stem	The elision of a portion of a stem

Prefix and suffix may be subsumed under the term adfix, in contrast to infix.
When marking text for interlinear glossing, as shown in the third column in the chart above, simple affixes such as prefixes and suffixes are separated from the stem with hyphens. Affixes which disrupt the stem, or which themselves are discontinuous, are often marked off with angle brackets. Reduplication is often shown with a tilde. Affixes which cannot be segmented are marked with a back slash.

Lexical affixes

Semantically, lexical or semantic affixes often convey more general or abstract meanings than their corresponding free nouns. For instance, an affix meaning “water” in a broad sense may lack a direct noun equivalent, since available nouns typically refer to more specific types such as “saltwater” or “whitewater.” Although they behave as incorporated noun roots/stems within verbs and as elements of nouns, they never occur as freestanding nouns. Lexical affixes are relatively rare and are used in Wakashan, Salishan, and Chimakuan languages — the presence of these is an areal feature of the Pacific Northwest of North America - where they 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:
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 gives examples of lexical suffixes in the Halkomelem language :
In sentence, the verb "wash" is šak’ʷətəs where šak’ʷ- is the root and -ət and -əs are inflectional suffixes. The subject "the woman" is łə słeniʔ and the object "the baby" is łə qeq. In this sentence, "the baby" is a free noun.
In sentence, "baby" does not appear as a free noun. Instead it appears as the lexical suffix -əyəł which is affixed to the verb root šk’ʷ-. The lexical suffix is neither "the baby" nor "a baby" ; such referential changes are routine with incorporated nouns.

Orthographic affixes

In orthography, the terms for affixes may be used for the smaller elements of conjunct characters. For example, Maya glyphs are generally compounds of a main sign and smaller affixes joined at its margins. These are called prefixes, superfixes, postfixes, and subfixes according to their position to the left, on top, to the right, or at the bottom of the main glyph. A small glyph placed inside another is called an infix. Similar terminology is found with the conjunct consonants of the Indic alphabets. For example, the Tibetan alphabet utilizes prefix, suffix, superfix, and subfix consonant letters.