- Magnitude is defined as large in size or very important.
- An example of magnitude is the depth of the Grand Canyon.
- An example of magnitude is the size of the problem of world hunger.

The great magnitude of the Grand Canyon.

## magnitude

noun

- greatness; specif.,
- of size
- of extent
- of importance or influence
- Obsolete of character

- size or measurable quantity: the
*magnitude*of a velocity - loudness (of sound)
- importance or influence

- size or measurable quantity: the
- Astron. a number representing the apparent brightness of a celestial body: it is part of an unlimited arbitrary scale that ranges from the brightest object, the sun, at -26.72 to the faintest visible object at
*c.*26: only 22 stars are brighter than 1.5 (first magnitude), while stars*c.*6 (sixth magnitude) are barely visible to the naked eye: each increase of one magnitude equals 2.512 times as much brightness (a magnitude increase of 5 is 100 times brighter) - Geol. a measure of the amount of energy released by an earthquake
- Math. a number given to a quantity for purposes of comparison with other quantities of the same class

Origin of magnitude

Classical Latin*magnitudo*; from

*magnus,*great: see magni-

**magnitude Idioms**

of the first magnitude

of the greatest importance

## magnitude

noun

- a. Greatness of rank or position:
*“such duties as were expected of a landowner of his magnitude”**(Anthony Powell).*b. Greatness in size or extent:*The magnitude of the flood was impossible to comprehend.*c. Greatness in significance or influence:*was shocked by the magnitude of the crisis.* -
*Astronomy*a. The brightness of a celestial body on a numerical scale for which brighter objects have smaller values. Differences in magnitude are based on a logarithmic scale that matches the response of the human eye to differences in brightness so that a decrease of one magnitude represents an increase in apparent brightness by a factor of 2.512. Also called*apparent magnitude*.b. A unit on such a scale of brightness. -
*Mathematics*a. A number assigned to a quantity so that it may be compared with other quantities.b. A property that can be described by a real number, such as the volume of a sphere or the length of a vector. -
*Geology*A measure of the amount of energy released by an earthquake, as indicated on the Richter scale.

Origin of magnitude

Middle English, from Old French,*size*, from Latin

*magnitūdō*,

*greatness, size*, from

*magnus*,

*great*; see

*meg-*in Indo-European roots.

## magnitude

Noun

(*countable and uncountable*, *plural* magnitudes)

- (uncountable, countable) The absolute or relative size, extent or importance of something.
- (countable) An order of magnitude.
- (mathematics) A number, assigned to something, such that it may be compared to others numerically
- (mathematics) Of a vector, the norm, most commonly, the two-norm.
- (astronomy) The apparent brightness of a star (on a negative, logarithmic scale); apparent magnitude
- (seismology) A measure of the energy released by an earthquake (e.g. on the Richter scale).