C1adjectiveformal2K

Mandatory

UK /["/ˈmændətəri//mænˈdeɪtəri/"]/US /["/ˈmændətɔːri/"]/

Definition

required by law

In simple words: Required by law or rules; something you must do.

Examples

  • The offence carries a mandatory life sentence.
  • It is mandatory for blood banks to test all donated blood for the virus.

Usage notes

Use 'mandatory' in formal contexts, such as laws or regulations. It's appropriate when something is not optional. However, avoid it in casual conversations.

Grammar pattern

mandatory + object

Memory hint

Think of 'man-date-ory' - a man needs to do this on a date, because it's mandatory!

Collocations

  • mandatory requirements
  • mandatory attendance
  • mandatory training
  • mandatory reporting
  • mandatory guidelines

Synonyms

  • compulsory

Antonyms

  • optional
  • voluntary
  • discretionary

Common mistakes

  • Confused with 'voluntary' which means optional.
  • Omitting 'is' or 'are' in sentences, e.g. saying 'This training is mandatory' as 'This training mandatory'.
  • Using 'mandatory' in informal contexts where simpler words like 'needed' would fit better.