Definition of fatal
1 obsolete : fated
2 : fateful a fatal hour
3a : of or relating to fate … this science sets a fatal necessity on things … — H. O. Taylorb : resembling fate in proceeding according to a fixed sequencec : determining one's fate the fatal flaw in this dazzling woman: a total lack of taste — Marya Mannes
4a : causing death a fatal crash a fatal disease a fatal woundb : bringing ruin a fatal attraction to gamblingc : causing failure a fatal design flaw Lack of sufficient support was fatal to his campaign.
Examples of fatal in a sentence
a disease that is often fatal
a chemical that can be fatal to birds
She made a fatal mistake.
Origin and Etymology of fatal
Middle English, from Latin fatalis, from fatum fate
First Known Use: 14th century
Synonym Discussion of fatal
FATAL Defined for English Language Learners
Definition of fatal for English Language Learners
: causing death
: causing ruin or failure
FATAL Defined for Kids
Legal Definition of fatal
1 : causing failure of a legal claim or cause of action a fatal defect in the proceedings — W. R. LaFave and J. H. Israel
2 : making something (as a contract) invalid or unenforceable there is a fatal indefiniteness with the result that the agreement is void — J. D. Calamari and J. M. Perillo
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