Replace 'formula' by 'formulae'. Some nouns have more than one plural form with different meanings.
that govern it.
| Noun (Singular) | Plural I | Meaning | Plural II | Meaning |
|---|
| Penny | Pennies | Separate coins | Pence | Collective noun |
| Fish | Fish | Considered collectively | Fishes | Considered separately |
| Shot | Shots | Throw, stroke or hit in certain games | Shots | Firing from the gun |
| Index | Indexe | Tables of contents | Indices | Signs in algebra |
| Cloth | Cloths | Pieces of cloth | Clothes | Garments |
| Brother | Brothers | Sons of the same parent | Brethre | Members of a community or society |