The word **size** may refer to how big or small something is. In particular:

- Measurement, the process or the result of determining the magnitude of a quantity, such as length or mass, relative to a unit of measurement, such as a meter or a kilogram
- Dimensions, including length, width, height, diameter, perimeter, area, volume
- Clothing sizes such as shoe size
- Body dimensions (Anthropometry)
- Human height, the distance from the bottom of the feet to the top of the head in a human body standing erect
- Human weight

- In statistics (hypothesis testing), the size of the test refers to the rate of false positives, denoted by α
- In computing, file size
- size (Unix), a command-line Unix tool
- Magnitude (mathematics), magnitude or size of a mathematical object
- Magnitude of brightness or intensity of a star or an earthquake as measured on a logarithmic scale
- In mathematics there are, in addition to the dimensions mentioned above (equal if there is an isometry), various other concepts of size for sets:
- measure (mathematics), a systematic way to assign to each suitable subset a number
- cardinality (equal if there is a bijection), of a set is a measure of the "number of elements of the set"
- for well-ordered sets: ordinal number (equal if there is an order-isomorphism)

- Resizing (fiction), a theme in fiction, in particular in fairy tales, fantasy, and science fiction
- Sizing, or size, a filler or glaze
- Demonstrating Size (dimension)

### Famous quotes containing the word size:

“Eat your meals according to the *size* of your bowl.”

—Chinese proverb.

“There are some persons we could not cut down to *size* without diminishing ourselves as well.”

—Jean Rostand (1894–1977)

“For truly I tell you, if you have faith the *size* of a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.”

—Bible: New Testament, Matthew 17:20.

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