出典:Wiktionary
Unclear. It formally matches Sanskrit कर्मन् (kárman, “action, deed; karma”), as if both were from Proto-Indo-European *kʷermon-, itself an abstract noun formed from Proto-Indo-European *kʷer- (“to do, make”). According to de Vaan, however, it's a derivation from the unattested adjective *caerus + -mōnia also found as the second part of the compound sincērus (“whole, sound”).
Romans folk-etymologized this word as if coming from the name of the city of Caere.
caerimōnia f (genitive caerimōniae); first declension
First-declension noun.
| Case | Singular | Plural |
|---|---|---|
| Nominative | caerimōnia | caerimōniae |
| Genitive | caerimōniae | caerimōniārum |
| Dative | caerimōniae | caerimōniīs |
| Accusative | caerimōniam | caerimōniās |
| Ablative | caerimōniā | caerimōniīs |
| Vocative | caerimōnia | caerimōniae |