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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 semi·di·ur·nal /-daɪˈɝnḷ/
 (a.)半天的,一天兩次的

From: Webster's Revised Unabridged Dictionary (1913)

 Sem·i·di·ur·nal a.
 1. Pertaining to, or accomplished in, half a day, or twelve hours; occurring twice every day.
 2. Pertaining to, or traversed in, six hours, or in half the time between the rising and setting of a heavenly body; as, a semidiurnal arc.
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