What does affix mean?
An affix is a small but powerful building block of language: a prefix, suffix, or similar element attached to a root or base word to create a new word or alter its grammatical behavior. Prefixes like 'un-' and suffixes like '-ness' are among the most familiar examples, and they allow English to generate vast numbers of words from a limited stock of roots. In linguistics, affixes are classified by position and function — derivational affixes create entirely new words, while inflectional affixes adjust forms for tense, number, or case. Separately, 'affix' also works as a verb meaning to fasten or attach something physically, as when you affix a stamp to an envelope or a seal to a document. This dual life makes the word useful in both scholarly and everyday contexts: it names the machinery of word formation on one hand and the simple act of attaching things on the other. Derived from Latin roots meaning 'to fix to,' it has been part of English since at least the early modern period.
A word element — typically a prefix or suffix — attached to a base or root to form a new word or alter its grammatical function.
"The affix '-ly' turns adjectives into adverbs."
In linguistics, affixes are categorized as derivational (creating new words) or inflectional (modifying grammatical form).
To attach, fasten, or secure one thing to another.
"She affixed the photograph to the bulletin board with two pins."
Often used in formal or legal contexts, e.g., affixing a signature or seal.
Standard plural; note that 'affixes' itself contains the plural suffix '-es', a fitting example of the concept it names.
"English inflectional affixes include '-s', '-ed', and '-ing'."
Every word you know that ends in -tion, -ness, or -ly owes its shape to an affix — tiny attachments doing enormous linguistic heavy lifting.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of affix
Affix derives from the Latin 'affigere,' meaning 'to fasten to,' formed from 'ad-' ('to') plus 'figere' ('to fix'). It entered English in the early 17th century, initially carrying the physical sense of attaching or fastening before developing its specialized grammatical meaning. It shares this Latin root with related terms such as 'fix,' 'fixture,' and 'prefix.'
Related word forms
How affix is actually used
In linguistics, 'affix' is a technical term with precise meaning, while in everyday use the verb sense (to affix a stamp, seal, or signature) dominates. The verb often appears in formal or legal contexts.
Easily confused with affix
A suffix is specifically an affix attached to the end of a word, whereas 'affix' is the broader term covering prefixes and suffixes alike.
A prefix is an affix placed at the beginning of a word; 'affix' is the general term for any such attached element.