Definition of Functional group

ETSI and 3GPP
Functional group
A set of functions that may be performed by a single equipment (source: ITU-T I.112).

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Functional group Definition from Encyclopedia Dictionaries & Glossaries

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Functional group
In organic chemistry, functional groups (or moieties) are specific groups of atoms within molecules, that are responsible for the characteristic chemical reactions of those molecules. The same functional group will undergo the same or similar chemical reaction(s) regardless of the size of the molecule it is a part of.

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