—v.sûr'taks", sûr-taks'), [key]
1. an additional or extra tax on something already taxed.
2. one of a graded series of additional taxes levied on incomes exceeding a certain amount.
to put an additional or extra tax on; charge with a surtax.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.