Source : Webster's Revised Unabridged Dictionary (1913)

Laterality \Lat`er*al"i*ty\, n.
   The state or condition of being lateral.

Source : WordNet®

laterality
     n 1: localization of function on either the right or left sides
          of the brain [syn: {lateralization}, {lateralisation}]
     2: the property of using one hand more than the other [syn: {handedness}]
     3: superior development of one side of the body [syn: {dominance}]