Webster’s Revised Unabridged Dictionary · 1913
Referendum
Ref′er·en′dum (r?f′?r·?n′d?m), n. [Gerundive fr. L. referre. See Refer.] 1. A diplomatic agent's note asking for instructions from his government concerning a particular matter or point.
2. The right to approve or reject by popular vote a meassure passed upon by a legislature.