All 4 Uses

meridian
in
Bartleby, the Scrivener: a Story of Wall Street
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In the morning, one might say, his face was of a fine florid hue, but after twelve o'clock, meridian—his dinner hour—it blazed like a grate full of Christmas coals; and continued blazing—but, as it were, with a gradual wane—till 6 o'clock, P.M. or thereabouts, after which I saw no more of the proprietor of the face, which gaining its meridian with the sun, seemed to set with it, to rise, culminate, and decline the following day, with the like regularity and undiminished glory.†
In the morning, one might say, his face was of a fine florid hue, but after twelve o'clock, meridian—his dinner hour—it blazed like a grate full of Christmas coals; and continued blazing—but, as it were, with a gradual wane—till 6 o'clock, P.M. or thereabouts, after which I saw no more of the proprietor of the face, which gaining its meridian with the sun, seemed to set with it, to rise, culminate, and decline the following day, with the like regularity and undiminished glory.†
All his blots upon my documents, were dropped there after twelve o'clock, meridian.†
*
Nevertheless, as he was in many ways a most valuable person to me, and all the time before twelve o'clock, meridian, was the quickest, steadiest creature too, accomplishing a great deal of work in a style not easy to be matched—for these reasons, I was willing to overlook his eccentricities, though indeed, occasionally, I remonstrated with him.†

Definitions:

(1) (meridian)
one of the imaginary lines between the north and south pole that are used to establish east-to-west position (longitude)
(2) (meaning too rare to warrant focus)
More rarely, meridian can refer to a similar imaginary line in astronomy or mathematics. Even more rarely, it can refer to a highest point, to noon, or to acupuncture points.

In the Midwest, meridian can refer to a highway median (a strip of land that separate highway lanes going in opposite directions).