Fatal \Fa"tal\, a. [L. fatalis, fr. fatum: cf. F. fatal. See Fate.]

1. Proceeding from, or appointed by, fate or destiny; necessary; inevitable. [R.]

These thing are fatal and necessary. --Tillotson.

It was fatal to the king to fight for his money. --Bacon.

2. Foreboding death or great disaster. [R.]

That fatal screech owl to our house That nothing sung but death to us and ours. --Shak.

3. Causing death or destruction; deadly; mortal; destructive; calamitous; as, a fatal wound; a fatal disease; a fatal day; a fatal error.

Source: Webster's Revised Unabridged Dictionary (1913)