memo vs tickler

memo

noun
  • A short note; a memorandum. 

  • A record of partial results that can be reused later without recomputation. 

verb
  • To record something; to make a note of something. 

  • To send someone a note about something, for the record. 

tickler

noun
  • A reminder. 

  • A tickler file, file cabinet, or similar containing memoranda of deadlines arranged in date order. 

  • Something puzzling; a poser. 

  • One who tickles. 

  • A person who or thing which amuses or excites. 

  • A latex condom that has additional protrusions, for enhancing the sexual pleasure of the user. 

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