An infix is an affix inserted inside a word stem (an existing word or the core of a family of words). It contrasts with adfix, a rare term for an affix attached to the outside of a stem, such as a prefix or suffix. [note 1]
What is an infix? Like prefixes and suffixes, infixes are part of the general class of affixes ("sounds or letters attached to or inserted within a word to produce a derivative word or an inflectional form").
Affixes are classified as prefixes, infixes, and suffixes, according to their position in the word: at the beginning, middle or end. Some languages have infixes, which are inserted within a word. Intensifying adjectives such as "flipping" and other, more vulgar, words can be used playfully as infixes, as in "un-flipping-believable".
An infix is a word element (a type of affix) that can be inserted within the base form of a word—rather than at its beginning or end—to create a new word or intensify meaning.
INFIX definition: a morpheme or an entire word that is inserted within the body of another word or element, as Latin m in accumbō “I lie down,” as compared with accubuī “I lay down.” See examples of infix used in a sentence.
An infix is a linguistic element that modifies the structure of a word by inserting itself into the center of the word. It’s also a morpheme, or a small unit of language that cannot be divided.
to fix, fasten, or drive in. 2. to implant. 3. to instill (a fact, idea, etc.) in the mind or memory; impress. 4. Grammar. to add as an infix. 5. Grammar (of a linguistic form) to admit an infix. 6. Grammar.