extension vs span

extension

noun
  • That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension") 

  • The set of tuples of values that, used as arguments, satisfy the predicate. 

  • Capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension. 

  • A file extension. 

  • University programs that are targeted at the broader (usually adults) community whose participants are not full-time enrolled students. 

  • A part of a building that has been extended from the original 

  • semantic widening, broadening of meaning 

  • An optional software component that adds functionality to an application. 

  • A simple offensive action, consisting of extending the weapon arm forward. 

  • The act of extending; a stretching out; enlargement in length, breadth, or time; an increase 

  • The operation of stretching a broken bone so as to bring the fragments into the same straight line. 

  • The state of being extended 

  • A written engagement on the part of a creditor, allowing a debtor further time to pay a debt. 

  • A numerical code used to specify a specific telephone in a telecommunication network. 

  • An exercise in which an arm or leg is straightened against resistance. 

  • A kind of derivative morpheme applied to verbs in Bantu languages. 

span

noun
  • A small space or a brief portion of time. 

  • The space of all linear combinations of something. 

  • A portion of something by length; a subsequence. 

  • The spread or extent of an arch or between its abutments, or of a beam, girder, truss, roof, bridge, or the like, between supports. 

  • The time required to execute a parallel algorithm on an infinite number of processors, i.e. the shortest distance across a directed acyclic graph representing the computation steps. 

  • wingspan of a plane or bird 

  • The length of a cable, wire, rope, chain between two consecutive supports. 

  • Any of various traditional units of length approximating this distance, especially the English handspan of 9 inches forming ⅛ fathom and equivalent to 22.86 cm. 

  • A pair of horses or other animals driven together; usually, such a pair of horses when similar in color, form, and action. 

  • A rope having its ends made fast so that a purchase can be hooked to the bight; also, a rope made fast in the center so that both ends can be used. 

  • The full width of an open hand from the end of the thumb to the end of the little finger used as an informal unit of length. 

verb
  • To extend through the distance between or across. 

  • To extend through (a time period). 

  • To measure by the span of the hand with the fingers extended, or with the fingers encompassing the object. 

  • To generate an entire space by means of linear combinations. 

  • To fetter, as a horse; to hobble. 

How often have the words extension and span occurred in a corpus of books? (source: Google Ngram Viewer )