Princeton's WordNet

1. acme, height, elevation, peak, pinnacle, summit, superlative, meridian, tiptop, top(noun)

   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"

2. Meridian(noun)

   a town in eastern Mississippi

3. meridian, line of longitude(adj)

   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"

4. meridian(adj)

   of or happening at noon

   "meridian hour"

5. prime, meridian(adj)

   being at the best stage of development

   "our manhood's prime vigor"- Robert Browning

Wiktionary

1. meridian(Noun)

   An imaginary great circle on the Earth's surface, passing through the geographic poles.

2. meridian(Noun)

   Either half of such a great circle, all points of which have the same longitude.

3. meridian(Noun)

   A great circle passing through the poles of the celestial sphere and the zenith for a particular observer.

4. meridian(Noun)

   A similar line on any general surface of revolution.

5. meridian(Noun)

   Any of the pathways on the body along which the vital energy is thought to flow and, therefore, the acupoints are distributed.

6. meridian(Noun)

   The highest point or state of consciousness and enlightenment achievable by a human.

7. meridian(Adjective)

   Meridional; relating to a meridian.

8. meridian(Adjective)

   Relating to noon

Webster Dictionary

1. Meridian(adj)

   being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course

2. Meridian(adj)

   pertaining to the highest point or culmination; as, meridian splendor

3. Meridian(adj)

   midday; noon

4. Meridian(adj)

   hence: The highest point, as of success, prosperity, or the like; culmination

5. Meridian(adj)

   a great circle of the sphere passing through the poles of the heavens and the zenith of a given place. It is crossed by the sun at midday

6. Meridian(adj)

   a great circle on the surface of the earth, passing through the poles and any given place; also, the half of such a circle included between the poles

The Nuttall Encyclopedia

1. Meridian

   an imaginary great circle passing through the poles at right angles to the equator.

• meridiaanAfrikaans
• خَط الزَّوال، خَط طولArabic
• меридианBulgarian
• meridianoPortuguese (BR)
• poledníkCzech
• der MeridianGerman
• meridian; længdegradDanish
• ο μεσημβρινόςGreek
• meridianoSpanish
• meridiaanEstonian
• خط نصف النهارFarsi
• meridiaaniFinnish
• méridienFrench
• קַו הַמִצהָרHebrew
• दोपहरHindi
• meridijanCroatian
• délkör, meridiánHungarian
• garis bujurIndonesian
• hádegisbaugurIcelandic
• meridianoItalian
• 子午線Japanese
• 자오선, 경선(經線)Korean
• meridianasLithuanian
• meridiānsLatvian
• meridianMalay
• meridiaanDutch
• lengdegradNorwegian
• południkPolish
• خط نصف النهارPersian
• ښهنصف نهار كرPashto
• meridianoPortuguese
• meridianRomanian
• меридианRussian
• poludníkSlovak
• poldnevnikSlovenian
• meridijanSerbian
• meridianSwedish
• เส้นวงกลมที่ลากผ่านขั้วโลกเหนือและใต้ตามยาวThai
• meridyenTurkish
• 子午線Chinese (Trad.)
• меридіанUkrainian
• قائم الظہیرہ، قطبین سماوی اور زمین پر کسی مقام کی سمت الراس پر سے گزرنے والا مفروضہ دائرہUrdu
• kinh tuyếnVietnamese
• 子午线Chinese (Simp.)