double date vs transaction

double date

noun
  • A (romantic) date that two couples go on together. 

verb
  • To go on a double date. 

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