protocol vs transaction

protocol

noun
  • An accepted code of conduct; acceptable behaviour in a given situation or group. 

  • A set of formal rules describing how to transmit or exchange data, especially across a network. 

  • The set of instructions allowing a licensed medical professional to start, modify, or stop a medical or patient care order. 

  • The official rules and guidelines for heads of state and other dignitaries, governing accepted behaviour in relations with other diplomatic representatives or over affairs of state. 

  • The official formulas which appeared at the beginning or end of certain official documents such as charters, papal bulls etc. 

  • The minutes, or official record, of a negotiation or transaction; especially a document drawn up officially which forms the legal basis for subsequent agreements based on it. 

  • An amendment to an official treaty. 

  • The first leaf of a roll of papyrus, or the official mark typically found on such a page. 

  • The original notes of observations made during an experiment; also, the precise method for carrying out or reproducing a given experiment. 

transaction

noun
  • The act of conducting or carrying out (business, negotiations, plans). 

  • A social interaction. 

  • A record of the proceedings of a learned society. 

  • An exchange or trade, as of ideas, money, goods, etc. 

  • A deal or business agreement. 

  • The transfer of funds into, out of, or from an account. 

  • An atomic operation; a message, data modification, or other procedure that is guaranteed to perform completely or not at all (e.g. a database transaction). 

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