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1. Having an unknown or unacknowledged name: an anonymous author.
2. Having an unknown or withheld authorship or agency: an anonymous letter.
3. Having no distinctive character or recognition factor: "They were carried over a bridge above an anonymous parade of shops" (Elizabeth Speller).
[From Late Latin anōnymus, from Greek anōnumos, nameless : an-, without; see a-1 + onuma, name (influenced by earlier nōnumnos, nameless); see nō̆-men- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.