Which term indicates 'not' in the context of music?

The term that indicates 'not' in the context of music is "non." This Italian and French word is commonly used in musical terminology to convey negation or the absence of something. For example, when a composer specifies "non" in a score, it instructs the performer to refrain from a particular action, such as playing a note or executing a particular technique.

The other terms have different meanings in musical context. "Avec," which translates to "with," typically indicates that something should be included or combined. "Sans," meaning "without," implies the exclusion of a specific element, but it doesn’t convey a direct negation like "non." "Moins" means "less," which conveys a degree or quantity, rather than a straightforward negation. Thus, "non" is the most accurate term to express the concept of 'not' in music.