noun
the first month of the Jewish calendar, occurring in February or March
adjective
relating to the first month of the Jewish calendar
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The holiday of Passover begins on the 15th of Nisan, also known as adar rishon in the Hebrew calendar.
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Let's make sure to mark adar rishon on our calendar so we don't forget about it.
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I heard there's a big party happening during adar rishon, we should definitely check it out.
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In the cycle of the Jewish calendar, adar rishon represents the beginning of a new year and fresh opportunities.