noun

• (uncountable) The concept or state of exchanging data or information between entities.
  "Some say that communication is a necessary prerequisite for sentience; others say that it is a result thereof."
• (anatomy) A connection between two tissues, organs, or cavities.
  "...and here a free communication had been established between the aorta and the vena cava."
• (obsolete) Association; company.
  "Evil communications corrupt good manners."
• (rhetoric) A trope by which a speaker assumes that his hearer is a partner in his sentiments, and says "we" instead of "I" or "you".
  "Communication[…]takes place when a speaker or writer assumes his hearer or reader as a partner in his sentiments and discourse, saying We, instead of I or Ye."