An **extension** is something that lengthens, widens, or increases the scope, duration, or size of something else.
It can refer to a physical addition, a period of time granted beyond the original limit, or a broadened application or interpretation.
It implies a continuation or expansion of an existing entity or concept. It can also denote a branch or department of an organization or a specific file type added to a file name.
The meaning always hinges on augmenting or amplifying the initial component. .
ARM
LIMB WING
ADDON ADDON ANNEX
ANNEXE
REFERENCE
ELONGATION DENOTATION
PROPAGATION LENGTHINESS ENLARGEMENT
CONTINUATION PROLONGATION
EXTENSIONPHONE
EXTENSIONSERVICE
FILENAMEEXTENSION
TELEPHONEEXTENSION
UNIVERSITYEXTENSION