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extension
1 a: the action of extending : state of being extended b: an enlargement in scope or operation <tools are extensions of human hands>2 a: the total range over which something extends : compass b: denotation 43 a: the stretching of a fractured or dislocated limb so as to restore it to its natural position b: an unbending movement around a joint in a limb (as the knee or elbow) that increases the angle between the bones of the limb at the joint
— compare flexion 4a4: a property whereby something occupies space5: an increase in length of time
; specifically : an increase in time allowed under agreement or concession6: a program that geographically extends the educational resources of an institution by special arrangements (as correspondence courses) to persons otherwise unable to take advantage of such resources7 a: a part constituting an addition b: a section or line segment forming an additional length c: an extra telephone connected to the principal line d: a length of natural or synthetic hair that is worn attached to one's natural hair e: a series of usually three or four characters following a dot at the end of the name of a computer file that specifies the file's format or purpose8: a mathematical set (as a field or group) that includes a given and similar set as a subset
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