What is the meaning of the term 'extremely'?

The term 'extremely' means 'very' in the context of intensity or degree. It is used to emphasize that something is at a high level or extent. For example, when someone says they are extremely happy, it indicates that their happiness is not just a little or moderately high but at a significantly heightened level. The use of 'extremely' serves to amplify the quality or state being described, thereby conveying a stronger sentiment.

Choosing 'very' captures this essence perfectly as it reflects a heightened degree without diminishing the intensity implied by 'extremely'. The other choices, such as 'not at all', 'less than average', and 'slightly', convey a sense of lower degree or lack of intensity, which does not align with the meaning of 'extremely'. Thus, the selection of 'very' aligns correctly with the meaning and usage of the term in common language.