non-fundamental

adjective

1. serving as, or being an essential part of, a foundation or basis; basic; underlying: fundamental principles; the fundamental structure.
2. of, relating to, or affecting the foundation or basis: a fundamental revision.
3. being an original or primary source: a fundamental idea.
4. Music. (of a chord) having its root as its lowest note.

noun

5. a basic principle, rule, law, or the like, that serves as the groundwork of a system; essential part: to master the fundamentals of a trade.
6. Also called fundamental note, fundamental tone. Music.
   1. the root of a chord.
   2. the generator of a series of harmonics.
7. Physics. the component of lowest frequency in a composite wave.

adjective

1. of, involving, or comprising a foundation; basic
2. of, involving, or comprising a source; primary
3. music denoting or relating to the principal or lowest note of a harmonic series
4. of or concerned with the component of lowest frequency in a complex vibration

noun

5. a principle, law, etc, that serves as the basis of an idea or system
6. 1. the principal or lowest note of a harmonic series
   2. the bass note of a chord in root position
7. Also called: fundamental frequency, first harmonic physics
   1. the component of lowest frequency in a complex vibration
   2. the frequency of this component

adj.mid-15c., “primary, original, pertaining to a foundation,” modeled on Late Latin fundamentalis “of the foundation,” from Latin fundamentum “foundation” (see fundament). Fundamentals “primary principles or rules” of anything is from 1630s.