The Collaborative International Dictionary of English v.0.48:

Regreet \Re*greet"\ (r?*gr?t"), v. t.
   To greet again; to resalute; to return a salutation to; to
   greet. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Regreet \Re*greet"\, n.
   A return or exchange of salutation.
   [1913 Webster]