Western Asset Municipal Defined Opportunity Trust Inc. (the Fund) is a non-diversified, closed-end management investment company. The Fund's primary investment objective is to provide high current income exempt from federal income tax and then to liquidate and distribute all of the Fund's net assets to shareholders. As a secondary investment objective, the Fund will seek total return. The Fund seeks to achieve its primary investment objective by investing, under normal market conditions, at least 80% of its net assets in investment grade municipal securities, the interest on which is exempt from federal income tax. The Fund may invest up to 20% of its net assets in municipal securities rated below investment grade at the time of purchase. Legg Mason Partners Fund Advisor, LLC (LMPFA) is the Fund's investment manager. Western Asset Management Company (Western Asset) is the Fund's sub adviser.