Webster's English Dictionary

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warn

warn \'wo.(*)rn\ \'wo.r-n*r\ vb [ME warnen, fr. OE warnian; akin to OHG 
   warno-n to take he]ed, OE wr careful, aware - more at WARY 1a: to give 
   notice to before hand esp. of danger or evil  1b: ADMONISH, COUNSEL  1c: to 
   notify or apprise esp. in advance : INFORM  2: to bid to go or leave  : to 
   give warning simple notification to something to be watched for or guarded 
   against to admonition or threats of violence or reprisal; FOREWARN 
   heightens the implication of notifying well in advance of impending danger 
   or peril; CAUTION stresses giving advice that puts one on guard or suggests 
   the need of precaution - warn.er n SYN syn FOREWARN, CAUTION: WARN may 
   range in meaning from