1. A procedure or sequence of actions that is based on random choice or personal whim rather than any reason or system; lacking fixed rules or standards
The hiring decisions were criticized as an arbitrary process with no clear criteria.
As decisões de contratação foram criticadas como um processo arbitrário sem critérios claros.
2. In mathematics and science, a process determined by subjective judgment rather than objective rules
The selection of variables in the model appeared to be an arbitrary process.
A seleção de variáveis no modelo parecia ser um processo arbitrário.