Size is the concept of how big or small something is. It may also refer to:
- In statistics (hypothesis testing), the size of the test refers to the rate of false positives, denoted by α
 - File size, in computing
 - 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
 - Size (surname)
 - Clothing size, the label sizes used for garments sold off-the-shelf
 - Size (band), a Mexican punk rock band
 
See also
- All pages with titles beginning with size
 - All pages with titles containing size
 
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