What is the meaning of "vicissitude"?

The term "vicissitude" refers to a change or variation, particularly one that is unpredictable or marked by fluctuations. It often denotes the ups and downs that one experiences in life or in circumstances, highlighting the notion that circumstances can vary over time. This understanding aligns perfectly with the choice of fluctuation, as vicissitudes imply a sense of change, whether it be in fortune, situation, or conditions.

In contrast, the meanings of the other options do not align with the concept of vicissitude. Quietness refers to a state of being calm or free from disturbance, which does not capture the essence of change implied by vicissitude. Courage signifies the ability to confront fear or difficulty, and anger describes an emotional state of displeasure or rage. Neither of these words relates to the idea of changes in state or condition that "vicissitude" embodies. Hence, fluctuation is the most accurate choice, as it encapsulates the essence of change and variation inherent in the meaning of vicissitude.