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Noun: vagary  vey-gu-ree
  1. An unexpected and inexplicable change in something (in a situation or a person's behaviour, etc.)
    "the vagaries of the weather"; "his wealth fluctuates with the vagaries of the stock market"; "he has dealt with human vagaries for many years"

Derived forms: vagaries

Type of: alteration, change, modification

Encyclopedia: Vagary