IPA: /pɪˈtɪʃənəri/
KK: /pɪˈtɪʃənɛri/
Relating to or characterized by making a formal request or appeal.
The group submitted a petitionary request to the city council for better public transportation.
Petitionary → It is formed from "petitio" (from Latin, meaning a request or appeal) and the suffix "-ary" (meaning relating to or connected with). The word "petitionary" refers to something that is related to making a request or appeal.
Think of 'petitio' as a request, and remember that 'petitionary' relates to making requests or appeals.