Webster's English Dictionary

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interval

in.ter.val \'int-*r-v*l\ n [ME intervalle, fr. MF, fr. L intervallum space 
   between ramparts, i]nterval, fr. inter- + vallum rampart - more at WALL 1: 
   a space of time between events or states : PAUSE  2a: a space between 
   objects, units, or states  2b: difference in pitch between tones  3: a set 
   of real numbers between two numbers either including or excluding  one or 
   both of them; also : the set of real numbers greater or less than and 
   including or excluding a real number