This is the 10838th most frequent French word.
officialiser
To make official.
In this sentence, 'officialiser' is used to mean making a relationship formal, often by a declaration or an act.
Ils ont décidé d'officialiser leur relation.
They decided to formalize their relationship.
Here, 'officialiser' refers to making an announcement to formally introduce a policy or plan.
Le président va officialiser la nouvelle politique demain.
The president will announce the new policy formally tomorrow.
'Officialiser' is used to signify the act of formalizing or legitimizing an agreement.