What is the meaning of ON OR ABOUT?

Legalese way of noting that the exact date of an event has not been determined.

Barry Goldsmith
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APABarry Goldsmith. (2010). on or about. Retrieved September 21, 2026, from http://smartdefine.org/on_or_about/definitions/1159610
ChicagoBarry Goldsmith. 2010. "on or about" http://smartdefine.org/on_or_about/definitions/1159610 (accessed September 21, 2026).
HarvardBarry Goldsmith 2010, on or about, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/on_or_about/definitions/1159610>.
MLABarry Goldsmith. "on or about" 21 October 2010. Web. 21 September 2026. <http://smartdefine.org/on_or_about/definitions/1159610>