> Even if the UNIX authors usually preferred the term "process" The OS I learned on was called CTOS, which used the term "process" to refer to "the basic unit

> Even if the UNIX authors usually preferred the term "process" The OS I learned on was called CTOS, which used the term "process" to refer to "the basic unit of code that competes in the scheduler for access to the CPU". A "task" was essentially what we'd now call a program, complete with libraries and sub-processes. We didn't use the term "thread". I think CTOS dates to about 1981.