definition of
meridian

[1] #1 meridian n. [acme, height, elevation, peak, pinnacle, summit, superlative, tiptop, top] the highest level or degree attainable; the highest stage of development; "his landscapes were deemed the acme of beauty"; "the artist's gifts are at their acme"; "at the height of her career"; "the peak of perfection"; "summer was at its peak"; "...catap. wn

[2] #2 meridian a. of or happening at noon; "meridian hour". wn

[3] #3 meridian n. [Meridian] a town in eastern Mississippi. wn

[4] #4 meridian n. [line of longitude] an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude". wn