To 'enhance' something means to:

To 'enhance' something means to improve or augment it, making it better in some way. When we talk about enhancement, we're referring to the act of adding quality, value, or attractiveness to an object, concept, or experience. For example, enhancing a photograph could mean adjusting its brightness and contrast to make it more visually appealing, while enhancing skills involves developing and improving one's abilities. The idea is to elevate from a current state to a more favorable one, which aligns perfectly with the definition of improvement.

The other interpretations don’t capture the essence of enhancement; reducing value would oppose the concept, making something more complicated doesn't inherently relate to improvement, and ignoring features would neglect the potential for anything to be enhanced. Thus, the focus on improvement or augmentation clearly defines the correct meaning of the term.