Synonyms: vagary
Definition: an unexpected and inexplicable change in something (in a situation or a person's behavior, etc.)
Usage: the vagaries of the weather; his wealth fluctuates with the vagaries of the stock market; he has dealt with human vagaries for many years
Similar words: change, modification, alteration
Definition: an event that occurs when something passes from one state or phase to another
Usage: the change was intended to increase sales; this storm is certainly a change for the worse; the neighborhood had undergone few modifications since his last visit years ago