What does the word necessary mean?

Usage examples for necessary

  1. Was it necessary, sir? – The Cattle-Baron's Daughter by Harold Bindloss
  2. But it is necessary, first of all, that you trust me. – The Mystery of Metropolisville by Edward Eggleston
  3. There's one point I didn't think necessary to tell your brother. – The Breaking Point by Mary Roberts Rinehart