annex vs extension

annex

noun
  • An addition, an extension. 

  • An appendix to a book or document. 

  • An addition to the territory of a country or state, from a neighbouring country or state, normally by military force. 

  • An addition or extension to a building. 

verb
  • To attach or connect, as a consequence, condition, etc. 

  • To join; to be united. 

  • To add something to another thing, especially territory; to incorporate. 

extension

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

  • 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. 

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

  • 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 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. 

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