What does the word four mean?

Usage examples for four

  1. It was four years since she had read so much. – Comrade Yetta by Albert Edwards
  2. It is almost four years since I was here last, is it not? – The Light of Scarthey by Egerton Castle
  3. These four years had made a great change in Miss Khayme. – Who Goes There? by Blackwood Ketcham Benson