| A | B |
|---|
| Decade | a period of 10 years |
| Century | a period of 100 years |
| Millennium | a period of 1000 years |
| Anno Domini | A latin term meaning "In the year of the lord" |
| C.E. | Common Era |
| B.C. | Before the birth of Christ |
| Circa | a term meaning about or approximately, often used in dates |
| B.C.E. | Before Common Era |
| Age | A distinctive period of history |
| Timeline | a line representing a period of time on which dates and the order of events are shown |
| A.D. | Anno Domini; a period time after the birth of Christ |
| Era | A period of years counted from a set point in time |
