Webster's English Dictionary

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lateral

1. lat.er.al \'lat-*-r*l, 'la-tr*l\ \-e-\ aj [L lateralis, fr. later-, 
   latus side] : of or relating to the side : situated on, directed toward, or 
   coming  from the side - lat.er.al.ly av
2. lateral n 1: a side ditch or conduit (as in a water system)  2: a mining 
   drift to one side of and parallel to a main drift