English

Definition of constant noun from the Oxford Advanced Learner's Dictionary

  

constant

 noun
noun
BrE BrE//ˈkɒnstənt//
 
; NAmE NAmE//ˈkɑːnstənt//
 
Experiments and research
 
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(specialist) a number or quantity that does not vary opposite variable See related entries: Experiments and research Word Origin late Middle English (in the sense ‘staying resolute or faithful’): from Old French, from Latin constant- ‘standing firm’, from the verb constare, from con- ‘with’ + stare ‘stand’. The noun senses date from the mid 19th cent.
See the Oxford Advanced American Dictionary entry: constant

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