The Collaborative International Dictionary of English v.0.48:

Hortatory \Hor"ta*to*ry\, a. [L. hortatorius.]
   Giving exhortation or advise; encouraging; exhortatory;
   inciting; as, a hortatory speech. --Holland.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hortatory
    adj 1: giving strong encouragement [syn: exhortative,
           exhortatory, hortative, hortatory]