compulsory (adjective)

1. In the dystopian world controlled by the oppressive government, it was compulsory for citizens to take a daily mind-altering drug.

2. In the classic novel, the protagonist faces a compulsory decision that will determine the outcome of the story.

3. The building code made it compulsory for all new constructions to include accessible entrances for people with disabilities.

4. In the magical realm, it was compulsory for every citizen to attend the annual gathering of wizards and witches.