fundamental

adj.

1. 1. Of or relating to the foundation or base; elementary: the fundamental laws of the universe.
   2. Forming or serving as an essential component of a system or structure; central: an example that was fundamental to the argument.
   3. Of great significance or entailing major change: a book that underwent fundamental revision.
2. Physics.
   1. Of or relating to the component of lowest frequency of a periodic wave or quantity.
   2. Of or relating to the lowest possible frequency of a vibrating element or system.
3. Music. Having the root in the bass: a fundamental chord.

n.

1. Something that is an essential or necessary part of a system or object.
2. Music. The first harmonic in a harmonic series; the lowest harmonic.
3. Physics. The lowest frequency of a periodically varying quantity or of a vibrating system.

fundamentally fun'da·men'tal·ly adv.

Basic requirements of an employee benefit insurance plan such as minimum age and years of service with an employer.

adjective

1. Arising from or going to the root or source: basal, basic, foundational, original, primary, radical, underlying. See surface/depth.
2. Of or being an irreducible element: basic, elemental, elementary, essential, primitive, ultimate, underlying. See surface/depth.
3. Constituting or forming part of the essence of something: basic, constitutional, constitutive, essential, integral, vital. See be, surface/depth.

noun

1. A fundamental irreducible constituent of a whole: basic, element, essential, rudiment (often used in plural). Idioms: part and parcel. See part/whole.
2. A fundamental principle or underlying concept: base¹, basis, cornerstone, foundation, fundament, root¹, rudiment (often used in plural). See over/under.
3. A broad and basic rule or truth: axiom, law, principle, theorem, universal. See order/disorder.

adj

Definition: basic, important
Antonyms: additional, advanced, auxiliary, extra, minor, secondary, subordinate, trivial, unimportant

n

Definition: basic, essential part
Antonyms: addition, auxiliary, extra, subordinate, trivia

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In acoustics, the lowest note in a harmonic series of frequencies that are multiples of its frequency.

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Any note that sounds, producing overtones in the harmonic series.

IN BRIEF: Basic, essential or most important.

Provision for others is a fundamental responsibility of human life. — Woodrow Wilson (1856-1924).

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Common misspelling(s) of fundamental

• fundametal

Dansk (Danish)
adj. - grund-, fundamental
n. - grundtræk, grundtone

Nederlands (Dutch)
fundamenteel, belangrijk, diepgeworteld, basis-, beginsel, het deel met de laagste frequentie, grondakkoord

Français (French)
adj. - fondamental, principal, essentiel, capital
n. - les fondements, les règles de base

Deutsch (German)
n. - Grundlage, Grundton
adj. - Grund-, elementar, fundamental, grundlegend

Ελληνική (Greek)
n. - θεμελιώδης αρχή, βασικό ή θεμελιώδες στοιχείο
adj. - βασικός, θεμελιώδης, κεφαλαιώδης

Italiano (Italian)
principio, tonica, fondamentale, essenziale

Português (Portuguese)
n. - fundamentos (m pl)
adj. - básico

Русский (Russian)
основа, основной, существенный, фундаментальный, необходимый

Español (Spanish)
adj. - fundamental, básico, esencial, principio, tono o nota fundamental
n. - principio, tono o nota fundamental, fundamento

Svenska (Swedish)
n. - grundläggande
adj. - fundamental, grund-

中文（简体）(Chinese (Simplified))
基本的, 原音的, 重要的, 基本原则, 根本法则, 纲要

中文（繁體）(Chinese (Traditional))
adj. - 基本的, 原音的, 重要的
n. - 基本原則, 根本法則, 綱要

한국어 (Korean)
adj. - 기본이 되는, 근본적인, 기본형의
n. - 기본, 원칙, 화음의 근음, 기본파

日本語 (Japanese)
adj. - 基本の, 根本的な, 重要な, 基本的な
n. - 基本, 原理, 原則

العربيه (Arabic)
‏(الاسم) الأساسي , القاعدة (صفه) أساسي‏

עברית (Hebrew)
adj. - ‮בסיסי, יסודי‬
n. - ‮כלל, עיקרון או סעיף יסודי‬

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Osullivan Fundamental	the fundamental of knife