IPA: /ˌplɛbɪˈsɪtəri/
KK: /ˌplɛbɪˈsɪtəri/
Relating to a direct vote in which an entire electorate is invited to vote on a particular proposal, often regarding changes in government or policy.
The government held a plebiscitary vote to decide on the new constitution.
Plebiscitary → It is formed from "plebis" (meaning of the common people) and "citus" (meaning to call or summon). The word refers to something related to a vote or decision made by the common people.
Think of the term for the common people ('plebis') being called to make a decision ('citus') — that's why plebiscitary relates to votes by the common people.
No commonly confused words.