referendum
n pl , -dums, -da
1 submission of an issue of public importance to the direct vote of the electorate
2 a vote on such a measure
3 a poll of the members of a club, union, or other group to determine their views on some matter
4 a diplomatic official's note to his government requesting instructions,
(See also (for senses 1, 2))
→
plebiscite (C19: from Latin: something to be carried back, from referre to refer)
ad referendum
adv
adj subject to agreement by others and finalization of details
an ad referendum contract
(Latin)