Webster's English Dictionary

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suicide

1. sui.cide \'su:-*-.si-d\ n [L sui (gen.) of oneself + E -cide; akin to OE 
   & OHG si-n]his, L suus one's own, Skt sva oneself, one's own 1a: the act or 
   an instance of taking one's own life voluntarily and intenti onally esp. by 
   a person of years of discretion and of sound mind 1b: ruin of one's own 
   interests  2: one that commits or attempts suicide 
2. suicide vi : to commit suicide to put (as oneself) to death : KILL