double Definition in Cambridge American English Dictionary
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Definition of "double" - American English Dictionary

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doubleadjective, adverb [not gradable]

 us   /ˈdʌb·əl/

double adjective, adverb [not gradable] (TWICE)

twice the size, amount, price, etc., or consisting of two similar things together: The cost of going to the movies is almost double what it was a few years ago. Fold the blanket double (= so that it is in two layers) and then you won’t be cold. A double bed is a bed for two people. If you are seeing double, you are seeing two of everything.

doublenoun [C usually sing]

 us   /ˈdʌb·əl/

double noun [C usually sing] (PERSON)

a person who looks the same as someone else: She is a double for Mary Tyler Moore.

doubleverb [I/T]

 us   /ˈdʌb·əl/

double verb [I/T] (TWICE)

to become twice as much or as many, or to make something twice as much or as many: [I] Company profits have doubled in the last year. [T] For four people, just double the recipe (= make twice as much). If something or someone doubles as something or someone else, that person or thing has a second use or job: [I] The kitchen table doubles as my desk.
Phrasal verbs
(Definition of double from the Cambridge Academic Content Dictionary © Cambridge University Press)
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