What best describes the term "anosmia"?

Anosmia refers specifically to the complete inability to smell. It indicates a total loss of the sense of smell, which can significantly impact an individual's ability to detect odors, appreciate scents, and even influence taste, as smell plays an important role in the perception of flavor.

In contrast, the other descriptions relate to different conditions. A partial loss of the sense of smell is known as hyposmia, not anosmia. The complete inability to taste would refer to ageusia, which is a distinct condition separate from olfactory function. Lastly, reduced olfactory function can occur in various conditions but does not equate to anosmia, as anosmia denotes an absence of smell rather than a reduction. Thus, the definition and context surrounding anosmia confirm that it is the complete inability to detect smells.