What does the word source mean?

Usage examples for source

  1. And as soon as the tension died down, she went back as to a source of peace to the failure of his powers of memory, obvious, complete. – Somehow Good by William de Morgan
  2. At home his presence was a source of comfort and joy to his mother. – Andy Grant's Pluck by Horatio Alger
  3. Poultry droppings, when dry, are not a source of danger if kept out of the feed. – The Dollar Hen by Milo M. Hastings