communication vs exchange of contracts

communication

noun
  • The concept or state of exchanging data or information between entities. 

  • A connection between two tissues, organs, or cavities. 

  • A trope by which a speaker assumes that his hearer is a partner in his sentiments, and says "we" instead of "I" or "you". 

  • An instance of information transfer; a conversation or discourse. 

  • A message; the essential data transferred in an act of communication. 

  • A passageway or opening between two locations; connection. 

  • Participation in Holy Communion. 

  • The body of all data transferred to one or both parties during an act of communication. 

  • The act or fact of communicating anything; transmission. 

exchange of contracts

noun
  • The act of exchanging contracts. 

  • The point or stage at which a conveyancing contract comes into existence between negotiating parties for the carrying out of a disposition of an estate in land; usually requiring the payment of a deposit. 

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