Suicide definition

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Intentional killing of oneself, as a kind of action or social phenomenon.
- 1904, Harold MacGrath, The Man On The Box, ch. 22:
  
  The cowardice of suicide was abhorrent to him.
A particular instance of a person intentionally killing himself or herself, or of multiple people doing so.
- 1919, Edgar Wallace, The Secret House, ch. 14:
  
  There had been half a dozen mysterious suicides which had been investigated by Scotland Yard.
- 1999, Philip H. Melling, Fundamentalism in America: Millennialism, Identity and Militant Religion, Edinburgh University Press, ISBN 978-0-7486-0978-9, page 192:
  
  In this way the Heaven’s Gate community were not only escaping the threat of ‘global destruction’, they were hurling themselves directly into ‘the lap of God’, using their suicide as a way of ‘bridging the chasm’ between an earthly world which had no future and ‘a thousand years of unmitigated peace’.
A person who has intentionally killed him/herself.
- 1915, W. Somerset Maugham, Of Human Bondage, ch. 95:
  
  "I remember one suicide," she said to Philip, "who threw himself into the Thames."
An action that creates serious difficulty for its performer.
- 1959, Everett Dirksen, in the Congressional Record, Feb. 9, page 2100:^{http://www.dirksencenter.org/print_emd_quotes.htm}
  
  I do not want the Congress or the country to commit fiscal suicide on the installment plan.

To kill oneself intentionally.
- 1917, Lucy Maud Montgomery, Anne's House of Dreams, ch. 11:
  
  "Her husband suicided three years ago. Just like a man!"