The Latin word '', literally meaning ''about'', is often used to describe various Date s (often Birth and Death dates) that are uncertain. The word is often abbreviated as ''c.'', ''ca.'', or ''cca.''
- Within the last hundred years, ''circa'' should be accurate to within five years (e.g., 1940 , 1945 , 1950 , 1955 );
- Within the last five hundred years, ''circa'' should be accurate to within ten years (e.g., 1720 , 1730 , 1740 , 1750 );
- Within the last thousand years, ''circa'' should be accurate to within twenty-five years (e.g., 1250 , 1275 , 1300 , 1325 );
- Within the last two thousand years, ''circa'' should be accurate to within fifty years (e.g., 150s , 200s , 250s , 300s );
- Within the span of recorded human history, ''circa'' should be accurate to within one hundred to two hundred years.
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