Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun meridian

3 senses of meridian

Sense 1
acme, height, elevation, peak, pinnacle, summit, superlative, meridian, 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"; "...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")
       => degree, level, stage, point -- (a specific identifiable position in a continuum or series or especially in a process; "a remarkable degree of frankness"; "at what stage are the social sciences?")

Sense 2
Meridian -- (a town in eastern Mississippi)
       INSTANCE OF=> town -- (an urban area with a fixed boundary that is smaller than a city; "they drive through town on their way to work")

Sense 3
meridian, 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")
       => great circle -- (a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center)

Antonyms of adj meridian

1 of 2 senses of meridian

Sense 2
prime, meridian -- (being at the best stage of development; "our manhood's prime vigor"- Robert Browning)

INDIRECT (VIA mature) -> immature -- (not yet mature)

Similarity of adj meridian

2 senses of meridian

Sense 1
meridian -- (of or happening at noon; "meridian hour")

Sense 2
prime, meridian -- (being at the best stage of development; "our manhood's prime vigor"- Robert Browning)
       => mature (vs. immature) -- (having reached full natural growth or development; "a mature cell")