Select the synonym of
"precedent"

* Precedent refers to an earlier event or action that is regarded as an example or guide to be considered in subsequent similar circumstances; a standard or rule.
Criterion means a principle or standard by which something may be judged or decided. It is the closest synonym.

Contingent means subject to chance or dependent on something else.

Arbitrary means based on random choice or personal whim, rather than any reason or system.

Fortuitous means happening by chance rather than intention; lucky.