This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or relating to the foundation or base; elementary: the fundamental laws of the universe.

adj. Forming or serving as an essential component of a system or structure; central: an example that was fundamental to the argument.

adj. Of great significance or entailing major change: a book that underwent fundamental revision.

adj. Physics Of or relating to the component of lowest frequency of a periodic wave or quantity.

adj. Physics Of or relating to the lowest possible frequency of a vibrating element or system.

adj. Music Having the root in the bass: a fundamental chord.

n. Something that is an essential or necessary part of a system or object.

n. Music The first harmonic in a harmonic series; the lowest harmonic.

n. Physics The lowest frequency of a periodically varying quantity or of a vibrating system.

n. A leading or primary principle, rule, law, or article, which serves as the groundwork of a system; essential part, as, the fundamentals of linear algebra.

adj. Pertaining to the foundation or basis; serving for the foundation. Hence: Essential, as an element, principle, or law; important; original; elementary; as, a fundamental truth; a fundamental axiom.

adj. Pertaining to the foundation or basis; serving for the foundation.

n. A leading or primary principle, rule, law, or article, which serves as the groundwork of a system; essential part, .

Pertaining to the foundation; serving as or being a component part of a foundation or basis; hence, essential; important; original; elementary: as, a fundamental truth or principle; a. fundamental law.

See fundamental, n., 2.

The low tone generated by the tones of a chord. Also called fundamental note.

n. A leading or primary principle, rule, law, or article, which serves as the groundwork of a system; an essential part: as, the fundamentals of the Christian faith.

n. In music: The root of a chord.

n. The generator of a series of harmonics. Also called fundamental bass, note, or tone.

n. the lowest tone of a harmonic series

adj. far-reaching and thoroughgoing in effect especially on the nature of something

n. any factor that could be considered important to the understanding of a particular business

adj. serving as an essential component

adj. being or involving basic facts or principles

"There's no real harm in the use of the term fundamental in this context, but this is about where the word gets elevated beyond its usefulness and starts becoming a hurdle to progress, and then a barrier."

significant    important    of import    basic   

accidental   

harmonic    factor   

elementary    essential    fundamental cells    fundamental tone    fundamental color    fundamental scale    fundamental truths    fundamental units    fundamental chord    fundamental propositions   

fundament   

fundamentalism    fundamentality    fundamentalness    fundamentalist    fundamental analysis   

basic    basal    underlying    ground    bottom    basilar    cardinal    basis    element    bare-bones   

Occidental    Oriental    accidental    coincidental    compartmental    continental    dental    departmental    detrimental    developmental   

basic    social    psychological    essential    definite