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WordBand 6.5–8Academic (NAWL)
circa
/ˈsɜːkə/
noun1 of 2
an approximate time period
preposition2 of 2
Approximately, about, around (typically in relation to time)
Source: New Academic Word List (Browne, Culligan & Phillips) (CC BY-SA 4.0); Wiktionary (CC BY-SA 3.0)