1. in a way that is based on personal choice or judgment rather than rules or reason
2. in a way that uses power unreasonably or unfairly

Examples

• The teacher arbitrarily assigned seats without considering student preferences.
• Numbers were chosen arbitrarily from a hat for the lottery.
• The dictator arbitrarily imprisoned citizens who disagreed with him.
• She arbitrarily decided to change the meeting time without consulting anyone.
• The judge was criticized for arbitrarily imposing harsh sentences.
• Colors were arbitrarily selected for the art project.
• The boss arbitrarily fired employees without proper cause.