incident vs transaction

incident

noun
  • An event or occurrence. 

  • An event that causes or may cause an interruption or a crisis, such as a workplace illness or a software error. 

  • A (relatively minor) event that is incidental to, or related to others. 

adj
  • Dependent upon, or appertaining to, another thing, called the principal. 

  • Liable to happen; apt to occur; befalling; hence, naturally happening or appertaining. 

  • Arising as the result of an event, inherent. 

  • Coming or happening accidentally; not in the usual course of things; not in connection with the main design; not according to expectation; casual; fortuitous. 

  • Falling on or striking a surface. 

transaction

noun
  • A deal or business agreement. 

  • A social interaction. 

  • A record of the proceedings of a learned society. 

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

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

  • 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 incident and transaction occurred in a corpus of books? (source: Google Ngram Viewer )