Nouns ending in -tion are feminine.
The suffix forms abstract nouns of action or state.
Is intention masculine or feminine?
l'intention
The rule behind it
99.8% of -tion nouns are feminine
In context
J'avais l'intention de finir le travail.
I intended to have finished the work.
Quand as-tu l'intention d'arrêter de fumer ?
When do you intend to quit smoking?
J'ai cueilli une pâquerette à son intention.
I plucked a daisy for her.