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Merriam-Webster's Collegiate DictionaryNor·mal \ˈnȯr-məl\ geographical nametown central Illinois N of Bloomington population 45,386nor·mal I \ˈnȯr-məl\ adjective ETYMOLOGY Latin normalis, from norma DATE circa 16961. perpendicular; especially : perpendicular to a tangent at a point of tangency2. a. according with, constituting, or not deviating from a norm, rule, or principle b. conforming to a type, standard, or regular pattern3. occurring naturally normal immunity4. a. of, relating to, or characterized by average intelligence or development b. free from mental disorder : sane5. a. of a solution : having a concentration of one gram equivalent of solute per liter b. containing neither basic hydroxyl nor acid hydrogen normal silver phosphate c. not associated normal molecules d. having a straight-chain structure normal pentane normal butyl alcohol6. of a subgroup : having the property that every coset produced by operating on the left by a given element is equal to the coset produced by operating on the right by the same element7. relating to, involving, or being a normal curve or normal distribution normal approximation to the binomial distribution8. of a matrix : having the property of commutativity under multiplication by the transpose of the matrix each of whose elements is a conjugate complex number with respect to the corresponding element of the given matrixSynonyms: see regular• nor·mal·i·ty \nȯr-ˈma-lə-tē\ noun• nor·mal·ly \ˈnȯr-mə-lē\ adverb II noun DATE circa 17381. a. a normal line b. the portion of a normal line to a plane curve between the curve and the x-axis2. one that is normal3. a form or state regarded as the norm : standardEnglish Etymologynormal 1650, "standing at a right angle," from L.L. normalis "in conformity with rule, normal," from L. normalis "made according to a carpenter's square," from norma "rule, pattern," lit. "carpenter's square" (see norm). Meaning "conformingt to common standards, usual" is from 1828. Normalcy is first attested 1857, originally as a mathematical term; normality is first attested 1849. Normal school (1834) is from Fr. école normale (1794), a republican foundation.Oxford Advanced Learner's Dictionary-牛津双解-OALD7☞ normalnor·mal / 5nC:ml; NAmE 5nC:rml / adjective1. typical, usual or ordinary; what you would expect 典型的；正常的；一般的: quite / perfectly (= completely) normal 相当/完全正常 Her temperature is normal. 她的体温正常。 It's normal to feel tired after such a long trip. 这样长途旅行之后感到疲劳是正常的。 Divorce is complicated enough in normal circumstances, but this situation is even worse. 在一般情况下,离婚已经够复杂了,但这一次情况更糟。 Under normal circumstances, I would say 'yes'. 一般情况下,我会说"行"。 He should be able to lead a perfectly normal life. 他应该能够过上完全正常的生活。 In the normal course of events I wouldn't go to that part of town. 通常我是不会到那个城区去的。 We are open during normal office hours. 在正常上班时间内,我们都开放。 2. not suffering from any mental disorder 精神正常的；意识健全的: People who commit such crimes aren't normal. 犯这种罪的人心理不正常。 OPP abnormal IDIOMS ⇨ see pernoun[U] the usual or average state, level or standard 常态；通常标准；一般水平: above / below normal 通常标准之上/之下 Things soon returned to normal. 情况很快恢复了正常。 Oxford Collocations Dictionary for Students of EnglishOxford Collocations dictionary for students of Englishnormal noun VERB + NORMAL be/go back to, return to After a week of festivities, life returned to normal. PREP. above ~ The rainfall has been above normal for the time of year. | below ~ Sales to December are well below normal. | near ~ His pulse rate had slowed to somewhere near normal. OLTnormal adj.⇨ normal (normal office hours)⇨ sane (normal people)Webster's Third New International Dictionary, Unabridgednor·malI. \ˈnȯrməl, ˈnȯ(ə)m-\ adjectiveEtymology: in sense 1, from Latin normalis according to a square, forming a right angle, from norma carpenter's square, pattern, rule (probably from Greek gnōmona, accusative of gnōmōn interpreter, discerner, pointer on a sundial, carpenter's square) + -alis -al; in senses 2-7 and 9-10, from Late Latin normalis according to rule, from Latin, according to a square; in sense 8, translation of French normale (in école normale normal school) — more at gnomon1. : forming a right angle : perpendicular2. : according to, constituting, or not deviating from an established norm, rule, or principle : conformed to a type, standard, or regular pattern : not abnormal : regular < normal word order of subject and verb > < normal working hours > < normal pronunciation >3. a. : unaffected by or not exposed to any particular infection or experimental treatment < a normal control animal > b. : occurring naturally and not because of disease, inoculation, or any experimental treatment < normal immunity >4. a. : of, relating to, or characterized by average intelligence or development : free from intellectual defect b. : free from mental disorder : having neither neurosis, personality disorder, nor psychosis : sane c. : characterized by balanced, well-integrated functioning of the organism as a whole within the limits imposed by the environment and in accord with the pattern of one's biological endowment5. : relating to or conforming with long-run expectations or to a permanent standard deviations from which on the part of individual economic phenomena are to be regarded as self-corrective < a normal price corresponds to long-run costs of production >6. a. : approximating the statistical norm or average < a normal infant mortality rate > < normal rainfall of the region > b. : consistent with the social norm < normal married life >7. : average over many years at a particular place and for a definite time, a certain day, or some other specified period — used of a meteorological element8. : of or relating to the training of teachers < normal college > < normal department >9. : of, relating to, or characterized by full ablaut grade10. a. of a solution : having a concentration of one gram equivalent of solute per liter < normal hydrochloric acid > — abbr. N b. : being an assumed fundamental compound (as an acid from which the known acids are obtained by dehydration) < normal sulfuric acid S(OH)6 > — compare orth- 3a c. : containing neither basic hydroxyl nor acid hydrogen < normal silver phosphate Ag3PO4 > — used of a compound (as a salt, ester, or amide) d. : not associated < normal liquids > < normal molecules > e. : having a straight-chain structure < normal pentane > < normal butyl alcohol > — abbr. n; used of an aliphatic hydrocarbon, one of its derivatives, or an alkyl radical; compare is- 2b f. : cis — used especially of stereoisomeric compounds containing two fused saturated rings; contrasted with allo < the allo and normal forms of steroids >Synonyms: see regularII. noun(-s)1. mathematics a. : perpendicular: (1) : a line perpendicular to the tangent line to a curve at a point of the curve (2) : a plane perpendicular to the tangent plane to a surface at a point on the surface b. : the intercept on the normal line between a curve and the x-axis2. : one that is normal: as a. : a normal person or organism b. : a normal level (as of temperature, pressure, rainfall, price) :mean, average c. : normal school3. : a form or state regarded as the norm : standardIII. adjective1. of a subgroup : having the property that every coset produced by operating on the left with a given element is equal to the coset produced by operating on the right with the same element2. : relating to, involving, or being a normal curve or normal distribution < normal approximation to the binomial distribution >3. of a matrix : having the property of commutativity under multiplication by the transpose of a matrix each of whose elements is a conjugate complex number with respect to the corresponding element of the given matrix

Normal B Having Element Curve A Matrix Acid