Webster's English Dictionary

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referendum

ref.er.en.dum \.ref-*-'ren-d*m\ \-d*\ n or ref.er.en.da or referendums [NL, 
   fr. L, neut. of refendus, gerundive of referre to refer] pl  1a: the 
   principle or practice of submitting to popular vote a measure passe d upon 
   or proposed by a legislative body or by popular initiative 1b: a vote on a 
   measure so submitted  2: a diplomatic agent's note asking his government 
   for instructions