They didn't invent the term. The term was invented first. The OSI was founded later. See the OSI's own post on this [1].
A much more detailed discussion of the origin of the term and its initial use appears here [2]. The latter link in particular is interesting reading, because it includes the political dimensions (especiall w.r.t O'Reilly's difficulties with the FSF).
A much more detailed discussion of the origin of the term and its initial use appears here [2]. The latter link in particular is interesting reading, because it includes the political dimensions (especiall w.r.t O'Reilly's difficulties with the FSF).
[1] https://opensource.org/history [2] http://www.oreilly.com/openbook/freedom/ch11.html