1. based on reason, logic, or established principles rather than personal whim or random choice

Examples

• The judge’s decision was nonarbitrary, based on clear legal precedent.
• Scientists use nonarbitrary methods to classify species.
• The grading system follows nonarbitrary criteria established by the department.
• Her choice of colors for the design was nonarbitrary, following color theory principles.
• The committee made nonarbitrary selections based on merit and qualifications.
• Mathematical proofs require nonarbitrary logical steps.