Needed or necessary according to rules or instructions.
“A valid photo ID is required to pick up the package from the office.”
“Please submit the required forms before the application deadline.”
This word often describes documents or steps needed to complete a process, such as 'required documents for the application.' In Part 1B, check the surrounding sentence carefully, since 'required' and 'mandatory' can both fit grammatically but only one may match the passage's meaning.
Synonyms: necessary, mandatory, obligatory