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fundamental

 
/ˌfʌn·dəˈmen·təl/ adj

Definition

being the most basic or most important thing on which other things depend: fundamental beliefs/principles We need to make fundamental changes in the way we treat our environment. fundamentals
 
/ˌfʌn·dəˈmen·təlz/ pl n
In the early grades, children learn the fundamentals of reading.
fundamentally
 
/ˌfʌn·dəˈmen·təl·i/ adv [not gradable]
Their economy was fundamentally (= basically) in good shape.
(Definition of fundamental adj from the Cambridge Academic Content Dictionary © Cambridge University Press)

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