Æ, or Æ, a diphthong compounded of A and E. Authors are by no means agreed as to the use of the æ in English words. Some, out of regard to etymology, insist on its being retained in all words, particularly technical ones, borrowed from the Greek and Latin; while others, from a consideration that it is no proper diphthong in our language, its sound being no other than that of the simple, contend that it ought to be entirely disused; and, in fact, the simple æ has of late been adopted instead of the Roman æ, as in the word equator, &c.