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Adjective: unprecedented  ,ún'pre-si,den-tid
  1. Having no precedent; novel; never seen before
    "an unprecedented expansion in population and industry"

See also: new, unexampled, unheard-of

Antonym: precedented

Encyclopedia: Unprecedented

Nearest

unpopular
unpopularity
unpopulated
unportable
unposed
unpotted
unpowered
unpractical
unpracticed
unpractised
unprecedented
unprecedentedly
unpredictability
unpredictable
unpredictably
unpredicted
unpredictive
unprejudiced
unpremeditated
unprepared
unprepossessing