INSTITUTE, Scotch law. The person first called in the tailzie; the rest, or the heirs of tailzie, are called substitutes. Ersk. Pr. L. Scot. 3, 8, 8. See Tailzie, Heir of; Substitutes. 2. In the civil law, an institute is one who is appointed heir by testament, and is required to give the estate devised to another person, who is called the substitute.