Source : Webster's Revised Unabridged Dictionary (1913)

Laterally \Lat"er*al*ly\, adv.
   By the side; sidewise; toward, or from, the side.

Source : WordNet®

laterally
     adv 1: to or by or from the side; "such women carry in their heads
            kinship knowledge of six generations depth and
            extending laterally among consanguineal kin as far as
            the grandchildren of second cousin"
     2: in a lateral direction or location; "the body is
        spindle-shaped and only slightly compressed laterally"