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onset
This term carries a heavy clinical or ominous weight. It is rarely used for positive beginnings, such as the start of a vacation or a romance, and is instead reserved for the arrival of diseases, storms, or periods of hardship. It suggests a threshold being crossed into a negative state. In medical and technical contexts, it describes the precise moment symptoms first appear. This creates a sense of an inevitable process starting to unfold, contrasting with words like start or beginning which are neutral and general.
Countable when referring to a specific instance of a beginning, such as the onset of a particular illness.