Invest  v. 1 a (often foll. By in) apply or use (money), esp. For profit. B (foll. By in) put money for profit into (stocks etc.). 2 (often foll. By in) devote (time etc.) To an enterprise. 3 (foll. By in) colloq. Buy (something useful). 4 a (foll. By with) provide or credit (a person etc. With qualities) (invested her with magical importance; invested his tone with irony). B (foll. By in) attribute or entrust (qualities or feelings) to (a person etc.) (power invested in the doctor). 5 (often foll. By with, in) clothe with the insignia of office; install in an office.  investor n. [latin vestis clothing]