Source : Webster's Revised Unabridged Dictionary (1913)

Companionship \Com*pan"ion*ship\, n.
   Fellowship; association; the act or fact of keeping company
   with any one. --Shak.

         He never seemed to avail himself of my sympathy other
         than by mere companionship.              --W. Irwing

Source : WordNet®

companionship
     n : the state of being with someone; "he missed their company";
         "he enjoyed the society of his friends" [syn: {company},
         {fellowship}, {society}]