Nouns ending in -tion are feminine.
The suffix forms abstract nouns of action or state.
Is disparition masculine or feminine?
ladisparition
The rule behind it
99.8% of -tion nouns are feminine
In context
C'est une espèce en voie de disparition.
It is an endangered species.
Nous devons enquêter sur la disparition du médecin.
We have to look into the disappearance of the doctor.
La mondialisation signifie-t-elle la disparition des putes de villages ?
Does globalisation mean the disappearance of local sluts?