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English definition of “variable”

variable

adjective  /ˈveər·i·ə·bəl, ˈvær-/ us  

variable adjective (CHANGING)

likely to change, or showing change or difference as a characteristic: Our weather is very variable in the spring.
variability
noun [U]  /ˌveər·i·əˈbɪl·ɪ·t̬i, ˌvær-/ us  
There is a lot of variability between brands.
variably
adverb  /ˈveər·i·ə·bli, ˈvær-/ us  

variable

noun [C]  /ˈveər·i·ə·bəl, ˈvær-/ us  

variable noun [C] (SYMBOL)

mathematics a letter or symbol that represents any of a set of values

variable noun [C] (CHANGING)

something that can change, esp. in a way that cannot be known in advance: Among the variables that could prevent us from finishing the building by June are the weather and the availability of materials.
(Definition of variable from the Cambridge Academic Content Dictionary © Cambridge University Press)
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