Required: meaning, definitions and examples

Typically used in official contexts, forms, instructions, or rules where something must be done or included.

• A valid ID is required to enter the building.
• Completion of the form is required before submission.

Generally used in everyday conversation to indicate that something is needed or essential, but without formal or official implications.

• It is necessary to drink water every day.
• Is it really necessary to bring your own food?

Used in similar contexts to 'required' but often implies stricter enforcement and possible penalties for non-compliance.

• It is mandatory to wear a seatbelt while driving.
• Compliance with the new safety regulations is mandatory.

Often used in educational, legal, or regulatory contexts where an action or process is not optional.

• Wearing a uniform is compulsory in our school.
• Attendance at this meeting is compulsory.

Used when something is needed or mandatory by rules, laws, or regulations.

• A valid ID is required to enter the building.
• You are required to finish the assignment by Friday.

Used to indicate that something makes a process or action unavoidable or essential.

• The project’s complexity will necessitate additional funding.
• Heavy traffic might necessitate leaving the house earlier.

Used when something is asked for aggressively or firmly, often implying a strong need or urgency.

• The manager demanded an explanation for the delay.
• She demanded to see the manager immediately.

Used when someone is bound by a duty, contract, or law to do something.

• The contract obligates employees to give a month's notice before resigning.
• We are obligated to report any suspicious activities.