What does the word caution mean?

Usage examples for caution

  1. If the former- He pressed on eagerly, yet keeping to the shadows, alive once more to the need of caution. – A Man and His Money by Frederic Stewart Isham
  2. Think about this caution of yours for a minute. – The Star Lord by Boyd Ellanby
  3. But he was a caution." – The Turnstile by A. E. W. (Alfred Edward Woodley) Mason