Sure, the meaning of the word “custodian” is:

Custodian

• A person who has custody of something, especially a building or property.
• A person who manages a property, organization, or group of people.

Examples:

• The librarian is the custodian of the library’s books.
• The headmaster is the custodian of the school.
• The superintendent is the custodian of the district.

Synonyms:

• Guardian
• Manager
• Overseer
• Stewards
• Tiler

Antonyms:

• Owner
• Holder
• Holder-out

I hope this information is helpful. Please let me know if you have any further questions.