The Collaborative International Dictionary of English v.0.48:

Greaten \Great"en\, v. i.
   To become large; to dilate. [R.]
   [1913 Webster]

         My blue eyes greatening in the looking-glass. --Mrs.
                                                  Browning.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Greaten \Great"en\, v. t.
   To make great; to aggrandize; to cause to increase in size;
   to expand. [R.]
   [1913 Webster]

         A minister's [business] is to greaten and exalt [his
         king].                                   --Ken.
   [1913 Webster]