Meaning of EXTENSION in English

EXTENSION

n.1 the act or an instance of extending; the process of being extended.

2 prolongation; enlargement.

3 a part enlarging or added on to a main structure or building.

4 an additional part of anything.

5 a a subsidiary telephone on the same line as the main one. b its number.

6 a an additional period of time, esp. extending allowance for a project etc. b permission for the sale of alcoholic drinks until later than usual, granted to licensed premises on special occasions.

7 extramural instruction by a university or college (extension course).

8 extent, range.

9 Logic a group of things denoted by a term.

Derivatives:

extensional adj.

Etymology: ME f. LL extensio (as EXTEND)

Oxford English vocab.      Оксфордский английский словарь.