Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having no previous example: unprecedented economic growth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Never before seen or done, without precedent.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having no precedent or example; not preceded by a like case; not having the authority of prior example; novel; new; unexampled.

from The Century Dictionary and Cyclopedia

  • Having no precedent or example; unexampled.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. having no precedent; novel

Etymologies

un- + precedent + -ed. (Wiktionary)

Examples

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  • adj. Having no previous example: unprecedented economic growth.

    August 25, 2013

  • WIZARD
    This is a highly irregular procedure! This
    is absolutely unprecedented!

    June 11, 2010

  • not bloody pronounced "unpresidented"

    July 20, 2009