The definition of double is twice as much or made of two parts.(adjective)
An example of something double is four cookies as opposed to two.
Double means something multiplied by two or something that looks or acts much like another.(noun)
An example of a double is a person who performs stunts for someone else in a movie.
Double is defined as to make twice as much or to fold in half.(verb)
An example of to double is to cut one piece of pizza into two.
See double in Webster's New World College Dictionary
Origin: ME < OFr < L duplus, lit., twofold (akin to Gr diploos) < duo, two + -plus < IE *plo-, -fold < base *pel-, to fold
See double in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old French
Origin: , from Latin duplus; see dwo- in Indo-European roots.
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