Webster's English Dictionary

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impair

Cross references:
  1. injure                
 
1. im.pair \im-'pa(*)r, -'pe(*)r\ \-m*nt\ vt [ME empeiren, fr. MF empeirer, 
   fr. (assumed) VL impejorare, f]r. L in- + LL pejorare to make worse - more 
   at PEJORATIVE : to diminish in quantity, value, excellence, or strength : 
   DAMAGEM - im.pair.er n
2. impair n archaic  : IMPAIRMENT, DETERIORATION