Anti-Dilution Provision A provision in an option or a convertible security. It protects an investor from dilution resulting from later issues of stock at a lower price than the investor originally paid. Also known as an "anti-dilution clause". Investopedia Says: These are common with convertible preferred stock, which is a favored form of venture capital investment. Related Terms: Convertible Preferred Stock Convertibles Diluted Earnings Per Share - Diluted EPS Diluted EPS Dilution Employee Stock Option - ESO Full Ratchet Provision Venture Capital |