Source : Webster's Revised Unabridged Dictionary (1913)

Brotherly \Broth"er*ly\, a.
   Of or pertaining to brothers; such as is natural for
   brothers; becoming to brothers; kind; affectionate; as,
   brotherly love.

   Syn: Fraternal; kind; affectionate; tender.

Brotherly \Broth"er*ly\, adv.
   Like a brother; affectionately; kindly. ``I speak but
   brotherly of him.'' --Shak.

Source : WordNet®

brotherly
     adj : like or characteristic of or befitting a brother; "brotherly
           feelings"; "close fraternal ties" [syn: {brotherlike},
           {fraternal}] [ant: {sisterly}]

brotherly
     adv : (archaic as adverb) in a brotherly manner