The definition of 50 is a number that represents half of one hundred. It is the fifth digit in the decimal system and it has two factors, namely 1 and itself. In Roman numerals, 50 is written as L.

50 can also be used to refer to something made up of fifty parts or units such as a pack of fifty cards or coins, an age group between forty-nine and fifty-one years old (the fifties) or even a size for clothing items like jeans (size 50).

When referring to money denominations such as dollars ($50), it means the amount equivalent to five tens which could either be represented by cash bills/coins or electronically via bank transfers etcetera.

In mathematics too, this number plays an important role; from basic operations like addition (+50), subtraction (-50) multiplication (*50) division (/50 )to more complex equations involving fractions with denominators being multiples of this figure e.g 1/100 = 0 .5 , 2/100=0 .1 etcetera are all examples where its value comes into play when solving arithmetic problems at any level ranging from elementary school through college levels alike.