historic

Concise Oxford English Dictionary © 2008 Oxford University Press:
historic/hɪˈstɒrɪk/

▶adjective

• 1 famous or important in history, or potentially so.

  ■ archaic of the past.

• 2 Grammar (of a tense) used in the narration of past events, especially Latin and Greek imperfect and pluperfect.

usage: Historic and historical are used in slightly different ways. Historic means ‘famous or important in history’ (a historic occasion), whereas historical chiefly means ‘concerning history’ (historical evidence).