Its not a commonly accepted "definition" - threads are a general concept that encompass several different forms of concurrency. It may be commonly assumed that

Its not a commonly accepted "definition" - threads are a general concept that encompass several different forms of concurrency. It may be commonly assumed that the term "thread", in absence of any other qualifier, refers to OS-level threads, however even that is context dependent. The Wikipedia page introduction is poorly written. However the more salient point here is the OP was either being lazy by saying "goroutines are not threads", or actually doesn't understand the concept of lightweight threads. Along the lines of Rob Pike's own explanation on the matter, he maybe should have said "goroutines provide concurrency but not parallelization".