Webster's English Dictionary

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hiatus

hi.a.tus \hi--'a-t-*s\ n [L, fr. hiatus, pp. of hiare to yawn - more at 
   YAWN] 1: a break in an object : GAP  2a: a lapse in continuity  2b: the 
   occurrence of two vowel sounds sithout pause or intervening consona ntal 
   sound