historic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having importance in or influence on history.
• adjective Historical.

from The Century Dictionary.

• Of or pertaining to history or historians; containing or conveying history.
• Noted or famous in history.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Of or pertaining to history, or the record of past events
• adjective having once lived, existed, or taken place in the real world; -- contrasted with legendary.
• adjective Belonging to the past; ; a historical character.
• adjective Within the period of time recorded in written documents. Opposite of prehistoric.
• adjective (Linguistics) Same as diachronic.
• adjective that branch of painting which represents the events of history.
• adjective that meaning of a passage which is deduced from the circumstances of time, place, etc., under which it was written.
• adjective the capacity to conceive and represent the unity and significance of a past era or age.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective having importance or significance in history
• adjective belonging to the past; historical (see note below)

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

• adjective important in history
• adjective belonging to the past; of what is important or famous in the past