infix

This term is primarily used in linguistics and computer science to describe a specific type of insertion. It carries a technical, precise connotation, distinguishing it from prefixes or suffixes by its internal placement. In linguistic contexts, it often refers to rare morphological processes in English but common ones in other languages, such as the insertion of -um- in certain Tagalog words.

In technical or programming contexts, the term describes the act of placing a character or string within an existing sequence. It implies a surgical precision, where the surrounding structure remains intact while the internal content is modified to change the identity or function of the string.