Used to describe a high point in the sky, just as objects like the sun or stars reach their highest position. During the eclipse, the moon reached its zenith and blocked the sun.
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Metaphorical Use
Often used metaphorically to suggest the peak of an abstract quality, like beauty or happiness. Her smile was at its zenith, lighting up the room.
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Positive Connotation
'Zenith' carries a positive tone, implying something is at its best or most favorable stage. At the zenith of his career, he was unstoppable.