meridian

(a) of or happening at noon
- meridian hour
(s) being at the best stage of development
- our manhood's prime vigor - Robert Browning
prime,

(n) 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
acme, summit, tiptop, elevation, height, pinnacle, superlative, peak, top,
(n) a town in eastern Mississippi
(n) 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
line of longitude,

acme summit tiptop elevation height pinnacle superlative peak top prime line of longitude