A more thorough explanation:

Definition: Legally right; lawful; equitable.

Example: The judge made a just decision by awarding custody to the parent who could provide a stable home environment for the child.

Explanation: In this example, the word "just" is used to describe a decision made by a judge that is legally right and fair. The decision was based on what was best for the child and followed the laws and regulations set forth by the court system.