obligatory

/əˈblɪɡəˌtɔri/
adjective
  1. Required by a rule, law, or custom; mandatory.
    • Wearing a seatbelt is obligatory in most countries.
    • In many cultures, a handshake is an obligatory greeting.
    • Attendance at the morning meeting is obligatory for all staff.
  2. Used humorously to describe something that is expected or typical in a situation.
    • Every family photo has the obligatory shot of the dog.
    • The movie included the obligatory car chase scene.
    • He made the obligatory joke about the weather at the start of his speech.
What does "obligatory" mean? | whatsthatwordmean | whatsthatwordmean