Meaning of “root” in the English Dictionary

"root" in British English

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rootnoun [ C ]

uk /ruːt/ us /ruːt/

root noun [ C ] (PLANT PART)

B2 the part of a plant that grows down into the earth to get water and food and holds the plant firm in the ground


root noun [ C ] (IN MATHEMATICS)

specialized mathematics a solution of some equations (= mathematical statements)

specialized A root of a particular number is another number that, when multiplied by itself one or more times, reaches that number:

The square root of 64 is 8, and the cube root of 64 is 4.


uk /ruːt/ us /ruːt/

(Definition of “root” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"root" in American English

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us /rut, rʊt/

root noun (PLANT PART)

[ C ] biology the part of a plant which grows down into the earth

[ C ] biology The root of a hair, tooth, or nail is the part of it that is inside the body.

root noun (ORIGIN)

[ C ] the origin or source of something:

We must get to the root of this problem.

root noun (WORD)

[ C ] the basic form of a word, to which prefixes or endings can be added:

The root of the word "sitting" is "sit."

root noun (number)

algebra a number that is the solution of an equation (= mathematical statement)

adjective [ not gradable ] us /ˈrut̬·əd, ˈrʊt̬-/

rootverb [ I/T ]

us /rut, rʊt/

root verb [ I/T ] (PLANT PART)

(of a plant) to develop roots and begin to grow

(Definition of “root” from the Cambridge Academic Content Dictionary © Cambridge University Press)