Circa (adverb)

Used to indicate that a date or time is approximate.

Origin:

From latin, meaning "around, about, approximately".

Examples:

1. The Roman Empire was at its height circa AD 117.
2. The concert will start at circa 8pm.
3. The book was published circa 1990.
4. The dinosaurs became extinct circa 65 million years ago.
5. The population of the city was circa 50,000 in the year 2000.