noun
A navigational instrument used to measure the angle between two visible objects, typically the horizon and a celestial body, to determine latitude and longitude.
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The sailor used a sextant to determine their position at sea.
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I found an old sextant in my grandfather's attic.
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Hey, check out this cool sextant I picked up at the flea market!
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In the journey of life, a good education can act as a sextant guiding you towards success.