Source : Webster's Revised Unabridged Dictionary (1913)

Exhortatory \Ex*hor"ta*to*ry\a. [L. exhortatorius: cf. F.
   exhortatoire.]
   Of or pertaining to exhortation; hortatory. --Holinshed.

Source : WordNet®

exhortatory
     adj : giving strong encouragement [syn: {exhortative}, {hortative},
            {hortatory}]