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Describing a unit nominally reproducible anywhere (rather than an arbitrary unit, defined by a physical prototype). In reality, of course, until very recent times, the natural references for units have been much harder to reproduce consistently than have those of a prototype.
[Glazebrook R. T. Nature Vol. 128, 17-28 (1931)] The idealistic geodesic definition for the metre was discarded after just two years, in favour of a prototype, to be replaced by light-based natural definitions nearly 200 years later. Such fundamental constants as the speed of light in a vacuum, the Newtonian constant of gravitation, the elementary charge, the Planck constant, the Compton wavelength, and the Bohr radius are now seen as preferable. Given an adopted time element, the first can fix a reference length, the next from that a reference mass. The Bohr radius and the Compton wavelength provide alternative fundamental units of length; the elementary charge of the proton provides a unit more fundamental for electricity than ampere or volt. The Planck constant, interrelating mass, length, and time, could replace any one of its components.

The atomic units of physics form one such set, using the Bohr radius for length; the explicitly named natural units, using the Compton wavelength plus other natural sub-atomic units, form another. Named generically natural units of action, etc., the members of this coherent set, and their current values (with 10⁸ times the relative standard uncertainty appended to each)
[Mohr P. J., Taylor B. N. CODATA Recommended Values of the Fundamental Physical Constants: 2002 (to be published)]
[Mohr P. J., Taylor B. N. Rev. Mod. Phys. Vol. 72:351-495 (2000)]
[Mohr P. Phys. Today Vol. 53:7, 11-16 (2000)]
[For latest recommended values, see http://physics.nist.gov/cuu/Constants/index.html] are shown below.

Base units: natural unit of

adjective

1. Produced by nature; not artificial or manmade: organic, unadulterated. Idioms: pure as the driven snow. See culture/nature.
2. In a primitive state; not domesticated or cultivated; produced by nature: native, rough, uncultivated, undomesticated, untamed, wild. See wild/tame.
3. Forming an essential element, as arising from the basic structure of an individual: built-in, congenital, connatural, constitutional, elemental, inborn, inbred, indigenous, indwelling, ingrained, inherent, innate, intrinsic, native. See be, native/foreign, start/end.
4. Devoid of any hypocrisy or pretense: genuine, heartfelt, hearty, honest, real, sincere, true, unaffected, unfeigned, unmannered. See true/false.
5. Free from guile, cunning, or deceit: artless, guileless, ingenuous, innocent, naive, simple, unaffected, unsophisticated, unstudied, unworldly. See honest/dishonest.
6. Unconstrained by rigid standards or ceremony: casual, easy, easygoing, informal, relaxed, spontaneous, unceremonious, unrestrained. Informal laid-back. See plain/fancy, tighten/loosen.
7. Of a plain and unsophisticated nature: artless, homely, homespun, rustic, unadorned, unpolished. See plain/fancy.
8. Accurately representing what is depicted or described: lifelike, naturalistic, realistic, true, true-life, truthful. See real/imaginary.
9. Born to parents who are not married to each other: baseborn, bastard, illegitimate, misbegotten, spurious, unlawful. See kin, law.

Definition: normal, everyday
Antonyms: abnormal, different, exceptional, uncommon, unnatural

adj

Definition: open, unaffected
Antonyms: affected, artificial, false, pretended, stilted, unnatural

adj

Definition: organic, unrefined
Antonyms: artificial, fixed, modified, processed, refined, unnatural

A note that has not been raised or lowered from its named pitch. On a piano, naturals are the white keys. Sharps or flats may be used to alter a natural pitch up or down a half step, respectively.

Occurs in nature, without the intervention of humans.

• n. experiments — occur by chance when all variables for a population are constant except one, which is different for one large part of the population compared with the other, e.g. when half of a flock comes from one climate and the other half is a local resident in another climate.
• n. focus — the ecology that is best suited to a biological system, e.g. an individual insect-borne disease; the area in which the disease naturally flourishes best; an ecological niche.
• n. history — history of a process or organism as it occurs in nature, e.g. course of a disease from infection to resolution.
• n. killer (NK) cell — see natural killer cell.
• n. selection — selection occurring in nature, without any human intervention, direct or indirect.
• n. ventilation — ventilation without the use of artificially induced energy and the machines which it drives; the forces used are wind and the exchange of heat from within the barn and the external air, controlled by ventilation devices in the walls and the ceiling.

• Hair Styles - natural: very curly hair grown long and bushy, esp. by African-Americans
• Harmony, Melody, and Structure - natural: return of a sharp or flat tone to its original pitch; original or normal pitch of note
• Baseball - natural: a way of describing a player who appears to have innate talent; also refers to a field with real grass
• Respectful or Admiring Reference
• Good, Sincere, Honest, or Just
• Giving, Trusting, Innocent, or Generous

Common misspelling(s) of natural

• naturual

Dansk (Danish)
adj. - naturlig
n. - naturtalent, hvid tangent, node uden fortegn, tosse
adv. - dur

idioms:

• C natural    C-dur
• natural childbirth    føde et barn uden brug af bedøvelse
• natural death    naturlig død
• natural gas    naturgas
• natural history    naturhistorie
• natural law    naturlov
• natural number    naturligt tal
• natural resources    råmaterialer, naturlige ressourcer
• natural sciences    naturvidenskab
• natural selection    naturlig udvælgelse

Nederlands (Dutch)
natuurlijk, natuur-, normaal, begrijpelijk (niet verrassend), naturel, favoriet, Afro-look, ongedwongen, geboren, echt, onwettig (kind), zonder kruisen/mollen (muziek), natuurtalent, herstellingsteken, witte toets (piano)

Français (French)
adj. - naturel, normal, inné, spontané, simple, (Mus) naturel
n. - naturel, (Mus) bécarre, note naturelle, imbécile
adv. - naturellement

idioms:

• C natural    (Mus) note naturelle en do
• natural childbirth    accouchement sans douleur, (Méd) accouchement psychoprophylactique
• natural death    mort naturelle
• natural gas    gaz naturel
• natural history    histoire naturelle
• natural law    loi naturelle
• natural number    nombre naturel
• natural resources    ressources naturelles
• natural sciences    sciences naturelles
• natural selection    sélection naturelle

Deutsch (German)
adj. - natürlich, Natur..., naturgetreu, von Geburt, leiblich, unehelich, naturfarben
n. - Naturtalent, Schwachsinniger, (Mus.) Auflösungszeichen, Stammton, weiße Taste, Naturfarbe
adv. - von Natur aus

idioms:

• C natural    C (als Stammton)
• natural childbirth    natürliche Geburt
• natural death    natürlicher Tod
• natural gas    Erdgas
• natural history    Naturkunde, Naturgeschichte
• natural law    Naturgesetz
• natural number    natürliche Zahl
• natural resources    Naturschätze
• natural sciences    Naturwissenschaften
• natural selection    natürliche Auslese

Ελληνική (Greek)
adj. - φυσικός, κατά φύσιν, έμφυτος, φυσιολογικός, απλός, ανεπιτήδευτος, νόθος
n. - γνήσιο ταλέντο

idioms:

• C natural    (μουσ.) λα φυσικό
• natural childbirth    φυσικός τοκετός
• natural death    θάνατος από φυσιολογικά αίτια
• natural gas    φυσικό αέριο
• natural history    φυσική ιστορία
• natural law    φυσικό δίκαιο
• natural number    (μαθημ.) φυσικός ακέραιος (αριθμός)
• natural resources    φυσικοί (πλουτοπαραγωγικοί) πόροι
• natural sciences    φυσικές επιστήμες
• natural selection    (βιολ.) φυσική επιλογή (των ικανοτέρων)

Italiano (Italian)
naturale, innato, spontaneo, disinvolto, persona adatta

idioms:

• C natural    do naturale
• natural childbirth    parto naturale
• natural death    morte naturale
• natural gas    gas naturale
• natural history    storia naturale
• natural law    legge di natura
• natural number    numero naturale
• natural resources    risorse naturali
• natural sciences    scienze naturali
• natural selection    selezione naturale

Português (Portuguese)
adj. - natural, inato, primitivo, semelhante, ilegítimo, não espiritual
n. - nativo (f), índole (f), realidade (f), sorte (f), número (m) natural (Mat.)

idioms:

• C natural    C natural
• natural childbirth    parto natural
• natural death    morte natural
• natural gas    gás natural
• natural history    história natural
• natural law    direito natural
• natural number    número natural
• natural resources    recursos naturais
• natural sciences    ciências naturais
• natural selection    seleção natural (Biol.)

Русский (Russian)
природный, врожденный, непринужденный, естественный, натуральный, прирожденный, бекар, дебил

idioms:

• C natural    до-бекар
• natural childbirth    роды без обезболивания
• natural death    смерть от естественных причин
• natural gas    природный газ
• natural history    естественная история
• natural law    естественное право
• natural number    положительная переменная
• natural resources    полезные ископаемые
• natural sciences    естественные науки
• natural selection    естественный отбор

Español (Spanish)
adj. - natural, innato, nato, congénito, sencillo
n. - persona con talento, carácter, forma o condición natural, idiota, simple, tecla blanca, becuadro, nota natural
adv. - de forma natural, sencillamente

idioms:

• C natural    do natural (becuadro)
• natural childbirth    parto natural
• natural death    muerte natural
• natural gas    gas natural
• natural history    historia natural
• natural law    ley natural
• natural number    número natural
• natural resources    recursos naturales
• natural sciences    ciencias naturales
• natural selection    selección natural

Svenska (Swedish)
adj. - naturlig, natur-, medfödd, otvungen, ursprunglig, självklar, normal, förklarlig, utomäktenskaplig, köttslig, vildväxande, utan förtecken (mus.)
n. - naturbegåvning, idiot, stamton, återställningstecken, vit tangent på piano

中文（简体）(Chinese (Simplified))
自然的, 天生的, 本能的, 天然的东西, 白痴, 天然地

idioms:

• natural childbirth    自然分娩, 自然生产
• natural death    生理死亡, 自然死亡
• natural gas    天然气
• natural history    博物学, 博物志
• natural law    自然法
• natural number    自然数
• natural resources    天然资源
• natural sciences    自然科学
• natural selection    自然选择, 物竞天择说

中文（繁體）(Chinese (Traditional))
adj. - 自然的, 天生的, 本能的
n. - 天然的東西, 白癡
adv. - 天然地

idioms:

• natural childbirth    自然分娩, 自然生產
• natural death    生理死亡, 自然死亡
• natural gas    天然氣, 天然瓦斯
• natural history    博物學, 博物誌
• natural law    自然法
• natural number    自然數
• natural resources    天然資源
• natural sciences    自然科學
• natural selection    自然選擇, 物競天擇說

한국어 (Korean)
adj. - 당연한, 자연적인, (그림)실물과 꼭 같은
n. - 백치, 자연, 제자리표, 타고난 명인
adv. - 자연스럽게

日本語 (Japanese)
adj. - 自然の, 天然の, 自然のままの, 未加工の, 当然の, 自然な, 生まれつきの, 生き写しの, 気取らない, 当然な, 自然科学の, 庶出の
n. - 適任の人, 本位音, ナチュラル, 白鍵, うってつけの人, 淡黄褐色

idioms:

• a natural affinity for    ～への生来的な類似性
• natural childbirth    自然分娩
• natural death    自然死
• natural gas    天然ガス
• natural history    博物学
• natural law    自然法, 自然律
• natural number    自然数
• natural resources    天然資源
• natural sciences    自然科学
• natural selection    自然淘汰

العربيه (Arabic)
‏(صفه) فطري, طبيعي, مألوف (الاسم) نوع نوته موسيقيه, شخص مناسب ( موهوب)‏

עברית (Hebrew)
adj. - ‮לא-מלאכותי, טבעי, צפוי, בצבע בז', טבוע, תורשתי, מבוסס על מוסר טבעי, בקר, בעל-חיוניות, גופני, בניגוד לרוחני‬
n. - ‮אדם מתאים, מפגר, מומחה, קליד לבן (פסנתר), בקר - סימן ביטול לבמול או לדיאז שצוינו לפני כן (מוסיקה)‬
adv. - ‮כמובן, באופן טבעי‬