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English definition of “fluid”

fluid

adjective (LIKELY TO CHANGE)    /ˈfluː.ɪd/
If situations , ideas , or plans are fluid, they are not fixed and are likely to change , often repeatedly and unexpectedly : The military situation is still very fluid.ChangingAdapting and modifying Adapting and attuning to somethingChanging frequently
(Definition of fluid adjective (LIKELY TO CHANGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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