consociation vs double date

consociation

noun
  • Intimate companionship or fellowship; (countable) an instance of this. 

  • A confederation of Christian churches or organizations. 

  • A voluntary, permanent council made up of representatives of neighbouring Congregational churches for mutual advice and co-operation in ecclesiastical matters; also, a meeting of pastors and delegates from churches thus united. 

  • A power-sharing arrangement over territory entered into by competing groups. 

  • A subdivision of an association, made up chiefly of organisms of a single species. 

  • Associating, or coming together in a union; (countable) an instance of this. 

double date

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

verb
  • To go on a double date. 

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