This is the 7637th most frequent Catalan word.
caducava
"Caducava" means "was expiring" or "used to expire."
Here, 'caducava' is used in the context of indicating something (a contract) reaching its date of expiry in the past.
El contracte caducava el mes passat.
The contract expired last month.
In this context, 'caducava' describes the passport becoming invalid prior to a specific event in the past.
El passaport caducava abans de poder viatjar.
The passport expired before being able to travel.
Here, 'caducava' is used to describe the permit's validity ending but with the implication of further action being possible.