infix.

1. An affix inserted within a word or stem rather than at its beginning or end.

2. Placed between the operands or arguments in a notation.

Use it for

Words that belong together

• grammatical infix
• infix formation

On the page

The grammar identified an infix inside the stem rather than a separate ending.

The infix formation was analyzed through its position and grammatical function.

Usage notes

Primary category: academic / formal. Forms: Singular infix; plural infixes. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: language analysis, sense distinction, word formation analysis, precise reference. Disciplines: academic writing, linguistics, dictionary and usage analysis. Commonness: uncommon.