Questions & Answers about Sponsio mea parva est, sed factio vincit.
Because both words are agreeing with sponsio, which is a feminine singular noun.
In Latin, adjectives and possessives usually agree with the noun they modify in:
- gender
- number
- case
So:
- sponsio = feminine singular nominative
- mea = feminine singular nominative, agreeing with sponsio
- parva = feminine singular nominative, also agreeing with sponsio
An English speaker may expect something more fixed, but Latin makes these relationships clear through endings.
Because parva is describing sponsio, and sponsio is feminine.
- parvus = masculine
- parva = feminine
- parvum = neuter
Since sponsio is feminine, the adjective must be feminine too: parva.
Also, in this sentence parva is a predicate adjective after est, but it still agrees with the subject.