#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 meridian a. of or happening at noon; "meridian hour". wn
#3 meridian n. [Meridian] a town in eastern Mississippi. wn
#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
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