- normal [nôr′məl]adj.[L normalis < norma, a rule: see NORM]1. conforming with or constituting an accepted standard, model, or pattern; esp., corresponding to the median or average of a large group in type, appearance, achievement, function, development, etc.; natural; usual; standard; regular2. Biol. occurring naturally [normal immunity]3. Chem.a) designating or of a salt formed by replacing all the replaceable hydrogen of an acid with a metal or metalsb) designating or of a solution which contains an amount of the dissolved substance chemically equivalent to one gram atom of hydrogen per liter of solutionc) designating or of a fatty hydrocarbon, the chain of which is continuous rather than branched, in which no carbon atom is united directly to more than two others4. Math. perpendicular; at right angles5. Med. Psychol.a) free from disease, disorder, or malformation; specif., average in intelligence or developmentb) mentally soundn.1. anything normal2. the usual state, amount, degree, etc.; esp., the median or average3. Math. a perpendicular; esp., a perpendicular to a line tangent to a curve, at its point of tangencynormalcy [nôr′məlsē]n.normality [nôr′mal′ə tē]SYN.- NORMAL implies conformity with the established norm or standard for its kind [normal intelligence ]; REGULAR implies conformity with the prescribed rule or accepted pattern for its kind [the regular working day ]; TYPICAL applies to that which has the representative characteristics of its type or class [a typical Southern town ]; NATURAL implies behavior, operation, etc. that conforms with the nature or innate character of the person or thing [a natural comedian ]; USUAL applies to that which conforms to the common or ordinary use or occurrence [the usual price ]; AVERAGE, in this connection, implies conformity with what is regarded as normal or ordinary [the average man ] -ANT. ABNORMAL, UNUSUAL
English World dictionary. V. Neufeldt. 2014.