ˌrefəˈrendəm noun
( plural referen·da -də ; or ref·erendums -dəmz)
Etymology: Latin, neuter of referendus to be referred, gerundive of referre to refer — more at refer
1.
a. : the principle or practice of submitting to popular vote a measure passed upon or proposed by a legislative body or by popular initiative
b. : a vote on a measure so submitted
c. : a similar practice or method for ascertaining the will of members of an organized group (as a union, club, faculty) : poll
2. : a diplomatic agent's note asking his government for instructions