There are multiple definitions - click on the translation that matches your context.

magistrado juez

full

senior judge

noun

Comparative law notes

Spain

magistrado

Definitions of senior judge

English

a US federal judge who has reached a specific age and who has worked as a judge for a specific length of time and can choose to reduce his or her workload by up 75%

He retired from the bench and currently sits as a senior judge.

English

the most important judge in a particular hierarchy of judges

Britain's most senior judge has called for a radical reform of the laws on fraud.