fə̇ˈd(y)üsh(ē)ə, fīˈ- noun
( plural fiduci·ae -shēˌē)
Etymology: Latin, literally, trust, confidence, from fidere to trust — more at bide
: a contract used under Roman and civil law (as in the emancipation of children, in connection with testamentary gifts, and in pledges) and constituting essentially a contract of sale to a person usually by mancipation coupled with an agreement that the purchaser should sell the property back upon the fulfillment of certain conditions — called also contractus fiduciae