Helyettesítési

Helyettesítési is a Hungarian term formed from the verb helyettesíteni (to substitute, replace) and the suffix -ési, used as an attributive or adjectival form. The base noun helyettesítés denotes the act of substituting or replacing one element with another, and the related adjective helyettesítési appears in compounds to describe processes, methods, or relations that involve substitution. The concept appears in various disciplines and everyday language, often with specialized meanings in each field.

In linguistics and grammar, helyettesítés refers to the replacement of a linguistic unit—such as a word, phrase, or morpheme—by another, for example using pronouns to stand in for noun phrases or deploying ellipsis where content is omitted but recoverable from context. In this sense, helyettesítési forms are language-structuring devices that influence coherence and reference.

In mathematics and computer science, helyettesítési módszer (the substitution method) denotes techniques in solving equations and integrals. A common example is substituting a new variable (u-substitution) to simplify an expression, or expressing one variable in terms of another in a system of equations and then substituting to reduce the system. The term is used broadly to describe any process where one quantity is replaced by another to facilitate analysis or computation.

In chemistry, helyettesítési reakciók (substitution reactions) describe reactions in which an atom or group in a molecule is replaced by another atom or group. These reactions are fundamental in organic synthesis and influence product structure and reactivity.

The term is widely used across disciplines to denote substitution-related concepts, with terminology varying by context. See also helyettesítés.