1. Of or happening at noon (synset 302877465)
    "meridian hour"
  2. Being at the best stage of development (synset 301492920)
    "our manhood's prime vigor"
  1. The highest level or degree attainable;
    The highest stage of development (synset 113963489)
    "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"; "...catapulted Einstein to the pinnacle of fame"; "the summit of his ambition"; "so many highest superlatives achieved by man"; "at the top of his profession"
  2. A town in eastern Mississippi (synset 109127772)
  3. An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator (synset 108616379)
    "all points on the same meridian have the same longitude"

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