1. a person (or institution) to whom legal title to property is entrusted to use for another's benefit
2. members of a governing board
3. A person to whom property is legally committed in trust, to be applied either for the benefit of specified individuals, or for public uses; one who is intrusted with property for the benefit of another; also, a person in whose hands the effects of another are attached in a trustee process.
4. To commit (property) to the care of a trustee; as, to trustee an estate.