"Greater volatility" means that there is more fluctuation or variation in something. It refers to situations or events that are more unpredictable, unstable, or subject to rapid changes. Full definition
Factors such as these, in the context of rising interest rates and high valuations, seem likely to result in greater volatility in the months ahead. (fidelity.com)
In some cases, these factors can cause greater volatility of stock prices and fund performance. (fidelity.com)
Small cap companies in these markets may react with greater volatility in reaction to activities in those markets. (motifinvesting.com)