Their attempt to occupy the term is a little offensive.
Correction: They came up with the name, so it's theirs. I'll leave my public embarrassment here.
OS came to us from the OSD, written by the OSI and after hot debate in the early days of what should and shouldn't be Free Software. It was specifically a reaction to the FSF and a rejection of that group's activism, which didn't fit what they were trying to do.
[1]: https://en.wikipedia.org/wiki/Open-source_software (specifically the first section starting with End of the 90s)
Still, it could matter it it ever came down to legal proceedings. But in everyday, colloquial terms, I think the OSD just "is" the definition of Open Source.
Edit: Yeah, see @CogitoCogito's post for more on the "Open Source predates OSI" argument. The counter-argument, I suppose, is that they didn't "coin" the phrase in the strictest sense, but were possibly the first to rigorously define it and give it meaning within a specific context. Whether or not one accepts that argument, or a similar argument, is obviously open to debate.
I don't imagine the F/OSS ecosystem would be much different today had the OSD/OSI never come to be, unlike say the Apache Foundation or GNU projects.
https://lunduke.substack.com/p/who-really-coined-the-term-op...
Digging further is for extreme nitpickers.
Gutenberg didn't "invent" the printing press either. Movable type dates back to 11th century China if you really want accurate attribution. Except for the purposes of the history of the modern world, Gutenberg's invention is most relevant/accurate.
My internet usage started on university systems back in the 80s, along with BBS and usenet and I had never heard the term Open Source even once until 1998.
They did not come up with the use of the word "open" in regard to computer software or standards. Any native or fluent English speaker could easily do that.
The term "open standard" was used in the 1980's. In the area of Unix, specifically, there existed The Open Group for Unix Systems (later called X/Open Company) and The Open Software Foundation. These two merged in 1996 to form The Open Group.
In the 1980's AT&T and Sun Microsystems collaborated on creating a standard GUI, and called it Open Look.
All these people were corporate cronies trying to create a monopolistic software ecosystem that they control; they used the word "open" insincerely: the obvious ingredient that was lacking was access to source code by anyone who isn't one of the oligarchs.
In that environment it was very easy for any random developer or user to come up with a lament along the lines "these Open This and Open That people have open standards and open systems and even software with the word Open in the name; the only ingredient missing is, oops, the actual open source code".
