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semidiurnal |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Semidiurnal \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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