What is Extension?

Extension definition and meaning on Dictionary terms:
an act or instance of extending, lengthening, stretching out, or enlarging the scope of something.
the state of being extended, lengthened, or stretched out.
that by which something is extended or enlarged; an addition: a four-room extension to a house.
an additional period of time given one to meet an obligation: My term paper wasn’t finished so I asked for an extension.
something that is expandable or can be extended; an extended object: a table with drop-leaf extensions.

range or scope of extending; degree of extensiveness; extent: the extension of our knowledge.
an additional telephone that operates on the principal line.
Commerce. a written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
Physics. that property of a body by which it occupies space.
Anatomy. the act of straightening a limb.the position that a limb assumes when it is straightened.

Surgery. the act of pulling the broken or dislocated part of a limb in a direction from the trunk, in order to bring the ends of the bone into their natural situation.
Also called extent. Logic. the class of things to which a term is applicable, as