'Solemnity' in the Bible
And Moses commanded them, saying, At the end of every seven years, in the solemnity of the year of release, in the feast of tabernacles,
So Jephthah went with the elders of Gilead, and the people appointed him head and military commander over them. Jephthah uttered everything he had to say with the solemnity of an oath in the LORD's presence at Mizpah.
Then Jeroboam ordained a solemnity in the eighth month, on the fifteenth day of the month, like unto the solemnity that was celebrated in Judah; and he sacrificed upon the altar. So did he in Bethel, sacrificing unto the calves that he had made. He also ordered in Bethel the priests of the high places which he had made.
Therefore, all the men of Israel assembled themselves unto the king in the solemnity which was in the seventh month.
Thus, the sons of Israel that were present at Jerusalem kept the solemnity of unleavened bread seven days with great gladness, and the Levites and the priests praised the LORD, day by day, with instruments of strength unto the LORD.
Ye shall have a song, as in the night when a holy solemnity is kept; and gladness of heart, as when one goeth with a pipe to come into the mountain of the LORD, to the mighty One of Israel.
Tau Thou hast called as to a day of solemnity my terrors from everywhere, so that in the day of the LORD's anger no one escaped nor remained: those that I have swaddled and brought up my enemy has consumed.
And in all seven days of the solemnity he shall prepare a burnt offering to the LORD, seven calves and seven rams without blemish daily the seven days; and a he goat daily as sin.
Meanwhile the Jews, because it was the day of Preparation for the Passover, and in order that the bodies might not remain on the crosses during the Sabbath (for that Sabbath was one of special solemnity)