What is referred to as an amount of money saved over a long period that is typically used for future expenses like retirement?

The term that describes an amount of money saved over a long period for future expenses, such as retirement, is often referred to as a "nest egg." This concept embodies the idea of building a financial cushion or reserve, specifically designated for significant future needs. The "nest egg" is typically a result of careful saving and investing, intending to provide security and financial stability during retirement or other important life stages.

In the context of long-term financial planning, a nest egg signifies a proactive approach to securing one's future, emphasizing the importance of starting to save and invest early. While the other options relate to financial concepts, they do not convey the same focus on an aggregate amount accumulated over time for future security. An investment, for instance, refers more broadly to the act of committing resources to yield a return rather than a specific saved amount. A savings account represents a vehicle for storing money but does not inherently imply a long-term strategy, and abundance speaks to a general state of having plenty, not specifically about saving for future expenses.