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Meaning of reference mark

ref'erence mark"

Pronunciation: [key]
  1. a permanent mark set at a specific distance in a specific direction from a survey station so as to permit accurate reestablishment of the station.
  2. any of various written or printed symbols, as an asterisk (*), dagger (†), or superscript number, used to indicate the presence of further information in a footnote, bibliography, or other text.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.