Webster's English Dictionary

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utmost

ut.most \'*t-.mo-st\ aj [ME, alter. of utmest, fr. OE u-tmest, superl. 
   adj., fr. u]-t out, adv. - more at OUT 1: situated at the farthest or most 
   distant point : EXTREME  2: of the greatest or highest degree, quantity, 
   number, or amount  - utmost n