Etymology: (1300–50; ME naturel < MF < L nātūrālis (see nature , -al1))
Definition of 'natural'
Princeton's WordNet
1. (noun)natural someone regarded as certain to succeed "he's a natural for the job"
2. (noun)natural, cancel a notation cancelling a previous sharp or flat
3. (adj)natural (craps) a first roll of 7 or 11 that immediately wins the stake
4. (adj)natural in accordance with nature; relating to or concerning nature "a very natural development"; "our natural environment"; "natural science"; "natural resources"; "natural cliffs"; "natural phenomena"
5. (adj)natural existing in or produced by nature; not artificial or imitation "a natural pearl"; "natural gas"; "natural silk"; "natural blonde hair"; "a natural sweetener"; "natural fertilizers"
6. (adj)natural existing in or in conformity with nature or the observable world; neither supernatural nor magical "a perfectly natural explanation"
7. (adj)natural functioning or occurring in a normal way; lacking abnormalities or deficiencies "it's the natural thing to happen"; "natural immunity"; "a grandparent's natural affection for a grandchild"
8. (adj)natural (of a musical note) being neither raised nor lowered by one chromatic semitone "a natural scale"; "B natural"
9. (adj)natural, instinctive unthinking; prompted by (or as if by) instinct "a cat's natural aversion to water"; "offering to help was as instinctive as breathing"
10. (adj)natural, raw(a), rude(a) (used especially of commodities) being unprocessed or manufactured using only simple or minimal processes "natural yogurt"; "natural produce"; "raw wool"; "raw sugar"; "bales of rude cotton"
11. (adj)natural related by blood; not adopted
12. (adj)natural, born(p), innate(p) being talented through inherited qualities "a natural leader"; "a born musician"; "an innate talent"
13. (adj)lifelike, natural free from artificiality "a lifelike pose"; "a natural reaction"
1. (adjective)natural existing in nature, not made by humans a drink made from all natural ingredients; a natural way to lower blood sugar; the beauty of the natural world
2. natural normal or reasonable It's natural to feel sad when a pet dies.; It seemed natural that she wanted to be with her brother.
3. natural existing from birth a natural talent for art; his natural leadership qualities
4. natural sincere and not seeming false Her smile was natural and sweet.
5. (noun)natural sb who does not have to try hard to do sth, or is exactly the right type to do sth As a pianist - he's a natural.; a natural to fill the position
Definition of 'natural'
Webster Dictionary
1. (adj)natural fixed or determined by nature; pertaining to the constitution of a thing; belonging to native character; according to nature; essential; characteristic; not artifical, foreign, assumed, put on, or acquired; as, the natural growth of animals or plants; the natural motion of a gravitating body; natural strength or disposition; the natural heat of the body; natural color
2. (adj)natural conformed to the order, laws, or actual facts, of nature; consonant to the methods of nature; according to the stated course of things, or in accordance with the laws which govern events, feelings, etc.; not exceptional or violent; legitimate; normal; regular; as, the natural consequence of crime; a natural death
3. (adj)natural having to do with existing system to things; dealing with, or derived from, the creation, or the world of matter and mind, as known by man; within the scope of humanreason or experience; not supernatural; as, a natural law; natural science; history, theology
4. (adj)natural conformed to truth or reality
5. (adj)natural springing from true sentiment; not artifical or exaggerated; -- said of action, delivery, etc.; as, a natural gesture, tone, etc
6. (adj)natural resembling the object imitated; true to nature; according to the life; -- said of anything copied or imitated; as, a portrait is natural
7. (adj)natural having the character or sentiments properly belonging to one's position; not unnatural in feelings
8. (adj)natural connected by the ties of consanguinity
9. (adj)natural begotten without the sanction of law; born out of wedlock; illegitimate; bastard; as, a natural child
10. (adj)natural of or pertaining to the lower or animal nature, as contrasted with the higher or moral powers, or that which is spiritual; being in a state of nature; unregenerate
11. (adj)natural belonging to, to be taken in, or referred to, some system, in which the base is 1; -- said or certain functions or numbers; as, natural numbers, those commencing at 1; natural sines, cosines, etc., those taken in arcs whose radii are 1
12. (adj)natural produced by natural organs, as those of the human throat, in distinction from instrumental music
13. (adj)natural of or pertaining to a key which has neither a flat nor a sharp for its signature, as the key of C major
14. (adj)natural applied to an air or modulation of harmony which moves by easy and smooth transitions, digressing but little from the original key
17. (noun)natural one born without the usual powers of reason or understanding; an idiot
18. (noun)natural a character [/] used to contradict, or to remove the effect of, a sharp or flat which has preceded it, and to restore the unaltered note
Definitions of natural 
Afrikaans: natuurlik
Arabic: طَبيعي
Bulgarian: природен
Brazilian: natural
Czech: přírodní
German: natürlich
Danish: naturlig
Greek: φυσικός, που προέρχεται α
Spanish: natural
Estonian: loodus-, looduslik
Farsi: طبیعی
Finnish: luonnollinen
French: naturel
Hebrew: טִבעִי
Hindi: प्राकृतिक
Croatian: prirodan, naravan
Hungarian: természeti; természetes
Indonesian: alami
Icelandic: náttúrulegur, náttúru-
Italian: naturale
Japanese: 天然の
Korean: 자연 그대로의
Lithuanian: gamtos, natūralus
Latvian: dabisks; dabas-
Malay: semula jadi
Dutch: natuurlijk
Norwegian: natur-, naturlig forekomm
Polish: naturalny
Persian: طبیعی
Pashto: طبيعى
Portuguese: natural
Romanian: natural
Russian: природный
Slovak: prírodný
Slovenian: naraven
Serbian: prirodan
Swedish: naturlig, natur-
Thai: เป็นธรรมชาติ
Turkish: doğal, tabiî
Taiwanese: 自然界的
Ukrainian: природний, натуральний
Urdu: قدرتي
Vietnamese: tự nhiên
Chinese: 自然界的
