Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: cenith, from Arabic samt (ar-ra's) 'path (above the head)'

zenith

noun
     
Related topics: Astronomy
zen‧ith [countable usually singular]
1 the most successful point in the development of something [= peak; ≠ nadir]
reach its zenith/be at its zenith
The Roman Empire reached its zenith around the year 100.
2 technicalHA the highest point that is reached by the sun or the moon in the sky

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