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At Definition & Meaning | Dictionary.com
https://www.dictionary.com/browse/at
(used to indicate a location or position, as in time, on a scale, or in order): at zero; at noon; at age 65; at the end; at the lowest point.
At Definition & Meaning – Merriam-Webster
https://www.merriam-webster.com/dictionary/at
at: [noun] a monetary subunit of the kip — see kip at Money Table.