All 5 Uses

solemn
in
Animal Farm
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The flag was run up and Beasts of England was sung a number of times, then the sheep who had been killed was given a solemn funeral, a hawthorn bush being planted on her grave.†
p. 43.9

solemn = very serious--possibly dignified
And the animals heard, from the direction of the farm buildings, the solemn booming of a gun.†
p. 105.3
The animals slain in the battle were given a solemn funeral.
p. 106.5 *

solemn = dignified
As his last act upon earth, Comrade Napoleon had pronounced a solemn decree: the drinking of alcohol was to be punished by death.†
p. 107.9

solemn = very serious--possibly dignified
'Up there, comrades,' he would say solemnly, pointing to the sky with his large beak — 'up there, just on the other side of that dark cloud that you can see — there it lies, Sugarcandy Mountain, that happy country where we poor animals shall rest for ever from our labors!'†
p. 117.7

solemnly = with seriousness and dignity

Definitions:

(1) (solemn)
in a very serious (and often dignified) manner
(2) (meaning too rare to warrant focus)
Less commonly, solemn can mean that something was done with great or appropriate ceremony. It can also be used to describe something as dark or undecorated.