a year chosen for comparison with other years, in statistical analysis and various indices, such as a price index. It usually has an arbitrary value of 100 to make percentage comparisons easier. A new base year can be chosen as the years progress.

plural of Julian year

plural of Christian year

(law) A year in the reign of a monarch, beginning on the day of accession, the set of which are numbered ordinally. Formerly laws in the United Kingdom were identified in part by the regnal year of the monarch, and this practice is still followed in some Commonwealth countries.

plural of regnal year

plural of man-year

plural of run year

plural of sidereal year

(historical) A period during the Cold War, characterized by left-wing and right-wing terrorism and the strategy of tension, beginning in Italy and later spreading to the rest of Europe.

An especially good year; a year of exceptional production.