GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Æ or Ae. A diphthong in the Latin language; used also by the Saxon writers.  It corresponds to the Gr. αι.  The Anglo-Saxon short æ was generally replaced by a, the long ǣ by e or ee.  In derivatives from Latin words with ae, it is mostly superseded by e.  For most words found with this initial combination, the reader will therefore search under the letter E.
   
   [1913 Webster]