| Singular | Plural | |
|---|---|---|
| Nominativ | efficacia | efficaciae |
| Genitiv | efficaciae, efficaciai | efficacium, efficaciarum |
| Dativ | efficaciae, efficaciai | efficaciabus, efficaciis |
| Akkusativ | efficaciam | efficacias |
| Ablativ | efficacia, efficaciad | efficaciis, efficaciabus |
| Vokativ | efficacia | efficaciae |
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