root Definition in the Cambridge English Dictionary
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Definition of “root” - English Dictionary

Definition of "root" - American English Dictionary

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rootnoun

 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 ​basicform 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 (= ​mathematicalstatement)
rooted
adjective [not gradable]  us   /ˈrut̬·əd, ˈrʊt̬-/
deeply rooted ​loyalty

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)

Definition of "root" - British English Dictionary

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rootnoun [C]

uk   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 ​plantfirm in the ​ground
More examples

root noun [C] (CAUSE/ORIGIN)

C1 the ​cause or ​origin of something ​bad: We must get to the root of (= ​discover the ​cause of) this ​problem. What is/​lies at the root of the ​problem is ​theirlack of ​interest. The high ​crimerate has ​its roots inunemployment and ​poverty. So what's the root cause of his ​anxiety?roots B2 [plural] origins: The ​city of Tours can traceits roots back toRomantimes.
See also

root noun [C] (OF TOOTH/HAIR/NAIL)

the ​part of a ​hair, ​tooth, or ​nail that is under the ​skin

root noun [C] (OF WORD)

specialized language The root of a word is ​its most ​basicform, to which other ​parts, such as affixes, can be ​added: The root of the word "​sitting" is "​sit".

root noun [C] (IN MATHEMATICS)

specialized mathematics a ​solution of some equations (= ​mathematicalstatements) specialized A root of a ​particularnumber 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.

rootverb

uk   us   /ruːt/

root verb (LOOK)

[I usually + adv/prep] to ​look for something by ​turning things over: She rooted through/among the ​papers on her ​desk. The ​pigs rooted foracorns in the ​forest.

root verb (PLANT)

[I] to ​grow roots: The ​treesfailed to root and so ​died.
(Definition of root from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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