Definitions of longest

  1. 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" Scrapingweb Dictionary DB
  2. for the most time; "she stayed longest" Scrapingweb Dictionary DB
  3. Superl. deg. of long; of the greatest extent. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.

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