What does the word could mean?

Usage examples for could

  1. If you could have heard her! – Flowing Gold by Rex Beach
  2. " I never said you could, my dear. – The Seaboard Parish, Complete by George MacDonald
  3. I come to see if you could tell me somethin' I could do for it. – The Story of a Doctor's Telephone--Told by His Wife by Ellen M. Firebaugh