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Meaning of checkoff

check•off

Pronunciation: (chek'ôf", -of"), [key]
— n.
  1. the collection of union dues by employers through compulsory deduction from each worker's wages.
  2. a voluntary contribution from one's income tax for a specific purpose, as the public financing of election campaigns, made by checking off the appropriate box on a tax return.
  3. audible (def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.