reliability; credibility; confidence level
Used in general contexts for trustworthiness of a person or thing, and in technical/statistical contexts for a confidence coefficient or reliability measure.
The reliability of this data is high.
His credibility is the highest in the company.
信頼度 refers to a measured level or degree of trust (e.g. a statistical confidence level), while 信頼性 refers to the general quality or attribute of being reliable.
Compound of 信頼 (trust, reliance) and 度 (degree, measure).