Definition of observable adjective from the Oxford Advanced Learner's Dictionary

 

observable

 adjective
adjective
BrE BrE//əbˈzɜːvəbl//
 
; NAmE NAmE//əbˈzɜːrvəbl//
 
 
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that can be seen or noticed observable differences Similar trends are observable in mainland Europe. The political crisis seems to be having little observable effect on share prices.
See the Oxford Advanced American Dictionary entry: observable