GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Dual , a. [L. dualis, fr. duo two. See Two.] Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, etc. , in Greek.
   1913 Webster
   Here you have one half of our dual truth.
   Tyndall.
   
   1913 Webster