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

 

precursor

 noun
noun
BrE BrE//priːˈkɜːsə(r)//
 
; NAmE NAmE//priːˈkɜːrsər//
 
 
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precursor (of/to something) (formal) a person or thing that comes before somebody/something similar and that leads to or influences its development synonym forerunner a stringed instrument that was the precursor of the guitar events that were precursors to revolution Word Origin late Middle English: from Latin praecursor, from praecurs- ‘preceded’, from praecurrere, from prae ‘beforehand’ + currere ‘to run’.
See the Oxford Advanced American Dictionary entry: precursor