This is the 6851st most frequent French word.
letitia
"Letitia" is not a French word; it is a Latin-derived name meaning "joy" or "happiness."
Here 'Letitia' is used as a proper noun, identifying an individual by name.
Letitia est une personne très gentille.
Letitia is a very kind person.
The word 'Letitia' again serves as a proper noun and is the subject of the sentence.
Quand Letitia arrive, tout le monde sourit.
When Letitia arrives, everyone smiles.
In this context, 'Letitia' is used as the recipient of an action performed by the speaker.