|Easton's Bible Dictionary|
A Persian word (Assyr, sivanu, "bricks"), used after the Captivity as the name of the third month of the Jewish year, extending from the new moon in June to the new moon in July (Esther 8:9).
Noah Webster's Dictionary
(n.) The third month of the Jewish ecclesiastical year; -- supposed to correspond nearly with our month of June.
Int. Standard Bible Encyclopedia
se-van', si'-van (ciwan): The third month of the Jewish year, corresponding to June (Esther 8:9).
Sivan (1 Occurrence)
Esther 8:9 Then the king's scribes were called at that time, in the third month Sivan, on the twenty-third day of the month; and it was written according to all that Mordecai commanded to the Jews, and to the satraps, and the governors and princes of the provinces which are from India to Ethiopia, one hundred twenty-seven provinces, to every province according to its writing, and to every people in their language, and to the Jews in their writing, and in their language. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)