What does the word labor mean?

Usage examples for labor

  1. But labor was scarce. – The Hidden Places by Bertrand W. Sinclair
  2. But to effect this the work of a few years must have become the labor of a life. – The Revolt of The Netherlands, Complete by Frederich Schiller
  3. There, close to where they slept, were the results of their faithful labor. – Roy Blakeley in the Haunted Camp by Percy Keese Fitzhugh