vahetumine

Vahetumine is an Estonian noun that denotes the act or process of exchanging, substituting, or alternating one thing for another. It is formed from the verb vahetama (to exchange or replace) with the -mine suffix that turns a verb into an abstract noun. The term is used in everyday language as well as in more technical discussions to describe a change or replacement.

In common usage, vahetumine can refer to practical exchanges or substitutions, such as replacing worn parts, switching roles, or trading items. For example, köögis toimus vahetumine: vanad osad asendati uutega (“in the kitchen there was an exchange: old parts were replaced with new ones”). It can also describe a broader alternation between states, options, or conditions.

In linguistics, vahetumine is used to discuss alternations in word forms or phonemes, where one morphophonemic form is replaced by another within a paradigm. This sense captures historical language changes or productive morphological processes that generate different forms of a word.

In science, more specific terms are often preferred for technical discussions. In chemistry or materials science, the concept closest to vahetumine is usually described with terms such as vahetusreaktsioon or ionvahetus (exchange reactions or ion exchange), where precise mechanisms are specified.

See also: vahetus, vahetusreaktsioon, morphophonology, allomorphy.