<p><strong>Noun:</strong></p><ul><li>an act or instance of extending, lengthening, stretching out, or enlarging the scope of something</li><li>the state of being extended, lengthened, or stretched out</li><li>that by which something is extended or enlarged; an addition: a four-room extension to a house</li><li>an additional period of time given one to meet an obligation: My term paper wasn't finished so I asked for an extension</li><li>something that is expandable or can be extended; an extended object: a table with drop-leaf extensions</li><li>range or scope of extending; degree of extensiveness; extent: the extension of our knowledge</li><li>an additional telephone that operates on the principal line</li><li>a written engagement on the part of a creditor, allowing a debtor further time to pay a debt</li><li>Physics: that property of a body by which it occupies space</li><li>Anatomy: the act of straightening a limb; the position that a limb assumes when it is straightened</li><li>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</li><li>Logic: the class of things to which a term is applicable, as “the class of such beings as Plato and Alexander” to which the term “man” is applicable</li><li>Mathematics: a function having a domain that includes the domain of a given function and that has the same value as the given function at each point in the domain of the given function</li><li>Computers: one or more characters at the end of a filename, usually following a period, used to indicate the type of file</li><li>Manège: the act of bringing or coming into an extended attitude</li></ul><p><strong>Adjective:</strong></p><ul><li>of or relating to extension courses</li></ul>