Definition

1. Noun:
   • The beginning or start of something, especially something unpleasant or challenging: "onset" most commonly refers to the initial stage or commencement of an event, process, or condition, often one that is difficult or negative.
   • (Military) An attack or assault: In a military or aggressive context, "onset" can refer to an offensive action against an enemy.

Examples of Usage

• Noun (Beginning/Start):

  • The onset of winter brings colder weather.
  • Early diagnosis is crucial after the onset of symptoms.
  • He felt fine until the sudden onset of the illness.

• Noun (Attack):

  • The enemy's onset was swift and brutal. (This usage is less common in everyday modern English and more literary or historical.)

Advanced Usage

• "at the onset of": at the very beginning of something.
  • At the onset of the project, we had limited resources.
• "the onset of age": the beginning of old age or its associated effects.
  • She remains very active despite the onset of age.

Variants and Related Words

• Onslaught (n): A fierce or destructive attack. This is a stronger, more common synonym for the "attack" meaning of "onset".
  • The village faced a sudden onslaught from the invaders.

Synonyms

• Beginning, start, commencement, outbreak: For the "start" meaning.
• Attack, assault, offensive: For the military/aggressive meaning.

Related Phrases

• Sudden onset: Used particularly in medicine to describe symptoms or a condition that begins abruptly.
  • The patient experienced sudden onset chest pain.

Noun

1. (military) an offensive against an enemy (using weapons)
   • the attack began at dawn
2. the beginning or early stages
   • the onset of pneumonia