The decorations added greatly to the gaiety of the room.
2
Merrymaking or festivity.
And he would tell her all sorts of wonders, old-world gaieties, long before she was born; and how finely the great Mr. [George Frideric] Handel played upon the harpischord^([sic]) in the Music Hall, and how his talk was in German, Latin, French, English, Italian, and half-a-dozen languages beside, […]
The decorations added greatly to the gaiety of the room.
Wiktionary
03
During the present gayety of the house, however, the poor girl has gone about with a face full of trouble, and to use the housekeeper's words, "has fallen into a sad hystericky way lately."
Wiktionary
04
Health and gaiety foster beauty.
Tatoeba · #238946
05
Her charm is compounded by her gaiety and kindness.
Tatoeba · #309777
06
The two girls, quite unconstrained and careless, danced in the freedom and gaiety of their hearts.
Tatoeba · #1718052
Usage Notes
i Register
In some senses, gaiety is marked as dated. Watch for register when choosing this word.