1. In a manner relating to or based on trust, confidence, or faith; as a fiduciary or trustee would act.
Usage: formal; chiefly legal or technical
2. In surveying and astronomy, with reference to a fixed point or line used as a reference mark.
Usage: technical; surveying

Examples

• The trustee acted fiducially in managing the estate on behalf of the beneficiaries.
• The lawyer advised her client to proceed fiducially with the investment.
• In the survey, measurements were taken fiducially from the marked baseline.
• The fiduciary relationship requires the agent to act fiducially at all times.
• The telescope's position was established fiducially using the reference star.