What does the word strain mean?

Usage examples for strain

  1. " I am an old soldier," said one of their officers, " and I hate to be a prisoner, but human nature cannot stand the strain of such bombardments." – From Bapaume to Passchendaele, 1917 by Philip Gibbs
  2. For there was a positive note in Jared that responded to the positive strain within himself. – Under the Skylights by Henry Blake Fuller
  3. The look of strain had gone if it was ever there. – The Turnstile by A. E. W. (Alfred Edward Woodley) Mason