Meaning of EXTENSION in English
1》 the action or process of extending.
↘an additional period of time given to someone to hold office or fulfil an obligation.
↘ Brit. permission granted to licensed premises for the sale of alcoholic drinks until later than usual.
2》 a part added to something to enlarge or prolong it.
↘( ~s ) lengths of long artificial hair woven into a person's own hair.
3》 a subsidiary telephone, especially one with its own additional number on a line leading from a main switchboard.
4》 ( Brit. also ~ lead or cable US also ~ cord ) a length of electric cable which enables appliances to be used at a distance from a fixed socket.
5》 [as modifier ] denoting instruction by a university or college for those who are not full-time students.
6》 the extending of a limb from a bent to a straight position.
↘ Ballet the ability of a dancer to raise one leg above the waist, especially to the side.
7》 Logic the range of a term or concept as measured by the objects which it denotes or contains. Often contrasted with intension .
8》 Physics & Philosophy the property of occupying space.
ME: from late L. extensio(n-) , from extendere (see extend ).
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004