초

Etymology 1
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Noun

 * 1) the SI unit of time, second
 * 2)  a second of arc

Etymology 2
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Noun

 * 1) the early part of a time period; the beginning
 * 2)  top
 * 1)  top
 * 1)  top

Noun

 * 1) candle

Etymology 4
Korean reading of various Chinese characters.