Definition: longest

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Source: WordNet (r) 1.7 

longest
     adj : having the greater length of two or the greatest length of
           several; "the longer (or long) edge of the door"; "the
           hypotenuse is the longest (or long) side of a right
           triangle" [syn: longer]
     adv : for the most time; "she stayed longest"

Source: Webster's Revised Unabridged Dictionary (1913) 

Long \Long\, a. [Compar. Longer; superl. Longest.] [AS.
   long, lang; akin to OS, OFries., D., & G. lang, Icel. langr,
   Sw. l[*a]ng, Dan. lang, Goth. laggs, L. longus. [root]125.
   Cf. Length, Ling a fish, Linger, Lunge, Purloin.]
   1. Drawn out in a line, or in the direction of length;
      protracted; extended; as, a long line; -- opposed to
      short, and distinguished from broad or wide.