decade - a period of 10 years, annual - yearly or once a year, B.C. - Before Christ, century - a period of 100 years, A.D. - anno domini (in the year of the Lord) , year - 365 1/4 days, chronological order - to arrange or put in order of time, interval - a period of time between events, C.E. - Common Era, B.C.E. - Before Common Era , c. - approximate (circa) , PreHistory - the time before written records, year 0 - does not exist,

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