normal
//ˈnɔːrməl//
Adjective
1
Conforming to a standard; usual, typical, or expected.
It's normal to feel nervous before an exam.
2
Free from physical or mental disorders; healthy.
The doctor said my test results were normal.
3
(mathematics) Perpendicular to a given line or surface.
The line is normal to the plane at this point.
Noun
1
The usual, average, or typical state or condition.
Things are finally getting back to normal after the storm.
2
(mathematics) A line or vector that is perpendicular to a given surface.
The normal to the plane passes through the origin.