affix vs append

affix

verb
  • To subjoin, annex, or add at the close or end; to append to. 

  • To attach. 

  • To fix or fasten figuratively; with on or upon. 

noun
  • Any small feature, as a figure, a flower, or the like, added for ornament to a vessel or other utensil, to an architectural feature. 

  • A bound morpheme added to the word’s stem's end. 

  • A bound morpheme added to a word’s stem; a prefix, suffix, etc. 

  • The complex number a+bi associated with the point in the Gauss plane with coordinates (a,b). 

  • That which is affixed; an appendage. 

append

verb
  • To add, as an accessory to the principal thing; to annex 

  • To write more data to the end of a pre-existing file, string, or other object. 

  • To hang or attach to, as by a string, so that the thing is suspended 

noun
  • An instance of writing more data to the end of an existing file. 

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