Formal:
* Recesses: This is the most formal and precise synonym, often used in legal or parliamentary settings.
* Suspends: This implies a temporary halt, usually with an intention to resume later.
* Postpones: This suggests a delay in the meeting or activity.
Informal:
* Breaks up: This is a more casual and conversational way to say "adjourns."
* Ends: This is a general synonym that can be used in any context.
* Disbands: This implies that the group or meeting is dissolved.
Specific to a legal context:
* Prorogues: This specifically refers to the adjournment of a legislative session.
* Sine die: This means "without a day" and indicates that a meeting is adjourned indefinitely.
Ultimately, the best synonym for "adjourns" will depend on the specific situation and the tone you want to convey.