Webster's English Dictionary

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dual

1. du.al \'d(y)u:-*l\ \d(y)u:-'al-*t-e-\ \'d(y)u:-*(l)-le-\ aj [L dualis, 
   fr. duo two - more at TWO] of grammatical number  1: denoting reference to 
   two  2a: consisting of two parts or elements or having two like parts : DO 
   UBLE 2b: having a double character or nature  - du.al.i.ty n
2. dual n : the dual number of a language or a form in it