'Solemn' in the Bible

Seven days ye shall present an offering by fire to Jehovah; on the eighth day shall be a holy convocation unto you; and ye shall present an offering by fire to Jehovah: it is a solemn assembly; no manner of servile work shall ye do.

On the eighth day ye shall have a solemn assembly: no manner of servile work shall ye do.

Six days thou shalt eat unleavened bread, and on the seventh day is a solemn assembly to Jehovah thy God; thou shalt do no work.

And Jehu said, Hallow a solemn assembly for Baal. And they proclaimed it.

And on the eighth day they held a solemn assembly; for they kept the dedication of the altar seven days, and the feast seven days.

Also day by day, from the first day to the last day, he read in the book of the law of God. And they observed the feast seven days; and on the eighth day was a solemn assembly, according to the ordinance.

Bring no more vain oblations! Incense is an abomination unto me, new moon and sabbath, the calling of convocations wickedness and the solemn meeting I cannot bear.

The ways of Zion do mourn, because none come to the solemn assembly: all her gates are desolate; her priests sigh, her virgins are in grief; and as for her, she is in bitterness.

But I that am Jehovah thy God from the land of Egypt will again make thee to dwell in tents, as in the days of the solemn feast.

Hallow a fast, proclaim a solemn assembly, gather the elders, and all the inhabitants of the land to the house of Jehovah your God, and cry unto Jehovah.

Blow the trumpet in Zion, hallow a fast, proclaim a solemn assembly;

I hate, I despise your feasts, and I will not smell a sweet odour in your solemn assemblies.

I will gather them that sorrow for the solemn assemblies, who were of thee: the reproach of it was a burden unto them.