Petitionary

[pi'tiʃәnәri]

(adj.) of the nature of or expressing a petition; 'the petitionary procedure had a quality of indecisiveness' .

Checked by Harlan--From WordNet

(a.) Supplicatory; making a petition.

(a.) Containing a petition; of the nature of a petition; as, a petitionary epistle.

Checker: Polly