There are 2 main definitions of normal in English:

normal1

Syllabification: nor·mal
Pronunciation: /ˈnôrməl
 
/

adjective

1Conforming to a standard; usual, typical, or expected: it’s quite normal for puppies to bolt their food normal working hours
More example sentences
  • The news was on a repeat schedule at this hour since it was normal for them to repeat the news at night.
  • Under normal circumstances you would expect the latter to have a much lower price tag.
  • The queue of traffic had stopped again after moving a few meters, a pace which seemed about normal for the rush hour in the middle of York on a Wednesday morning.
Synonyms
1.1(Of a person) free from physical or mental disorders.
More example sentences
  • In some cases, children with dominant single gene disorders are born to normal parents.
  • He's just a normal person that probably has a few mental issues he needs to deal with.
  • Take advantage of this quiet mental time to see how normal people live.
2 technical (Of a line, ray, or other linear feature) intersecting a given line or surface at right angles.
More example sentences
  • Unless the radar signal is normal to some surface (extremely low probability) the radar receives no return.
  • In physics, the critical angle is described with respect to the normal line.
  • The hard perturbations in this study caused the trajectory to move in a direction that was normal to the limit cycle.
3 Medicine (Of a salt solution) containing the same salt concentration as the blood.
More example sentences
  • Therefore, 1L of normal saline should be given per hour to start.
  • An infusion of IV normal saline frequently corrects hypotension and increases cardiac output.
  • The probe was rinsed with sterile normal saline between measurements of each raft.
3.1 Chemistry , dated (Of a solution) containing one gram-equivalent of solute per liter.
4 Geology Denoting a fault or faulting in which a relative downward movement occurred in the strata situated on the upper side of the fault plane.
More example sentences
  • As much as 1.3 km of sediment were eroded on the footwall blocks of normal faults at that time.
  • In addition, large-scale isoclinal folds and normal faults with throws exceeding 10m locally occur.
  • Massive dolomite and dolomitic breccias are separated by a normal fault from the upper part of the sequence.

noun

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1The usual, average, or typical state or condition: her temperature was above normal the service will be back to normal next week
More example sentences
  • Things have reverted pretty much back to normal, or whatever normal means when Lindsey and I are involved.
  • He was back to normal, well normal for him, but definitely strange to most people.
  • Everything is now back to normal and the game continues every Wednesday night.
1.1 informal A person who is conventional or healthy .
More example sentences
  • As Modes had promised beforehand, the march ended with the clowns piling into three small cars and driving off, ‘leaving the normals confused and frightened.’
  • ‘Ah, but if Mutants are perfectly capable of living with normals,’ she observes, ‘why are they exiled from the rest of us?’
  • Also, let us not forget that the military institution provides us with a means to segregate the less desirable members of society from the rest of us normals.
2 technical A line at right angles to a given line or surface.
More example sentences
  • Since normals to a straight line never intersect and tangents coincide with the curve, evolutes, involutes and pedal curves are not too interesting.
  • It deals with normals to conics regarded as maximum and minimum straight lines drawn from particular points to the curve.
  • Since these forces are strongest for orientation of the surface normal perpendicular to the rotation axis, this may cause a slight preference for alignment of the bilayer normals perpendicular to the rotor axis.

Origin

mid 17th century (in the sense 'right-angled'): from Latin normalis, from norma 'carpenter's square' (see norm). Current senses date from the early 19th century.

Phrases

the new normal

A previously unfamiliar or atypical situation that has become standard, usual, or expected: 32% of Americans say spending less is the new normal, according to a recent poll
More example sentences
  • Is $3 gas the new normal?
  • The term 'extreme weather' has become the new normal.
  • Crisis has become the new normal for the nuclear medicine department at the Trois-Rivieres regional hospital, he said.

Definition of normal in:

There are 2 main definitions of normal in English:

Normal2

Syllabification: Nor·mal
Pronunciation: /ˈnôrməl
 
/
A town in central Illinois, home to Illinois State University (originally a normal, or teachers, school); population 52,056 (est. 2008).