meridian

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meridian
A. † midday XIV; point of sun's or star's highest altitude XV;

B. great circle of the earth or a celestial sphere XIV; individual locality XVI; adj. XIV. — (O)F. méridien or L. merīdiānus, f. mērīdiēs, nom. f. loc. merīdiē, by dissim. from *mediei diē at midday.
So meridional XIV. — F. — late L.

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