So, while doing some research on on the World Health Organization (WHO), I noticed it had a constitution.
I found this weird, because I always had associated the word "Constitution" with countries, not organizations. For instance, the United States has a Constitution, as do many others too numerous to list here.
It's my understanding that the WHO is an organization (hence, the o in its name) and is a part of the United Nations, not a sovereign nation. So why exactly does it have a constitution? Why exactly do they choose this word, as opposed to something like "bylaws" instead?
Edit: I seem to have drawn some confusion on what I'm asking here. I'm not asking for the dictionary definition of "Constitution." I'm what about it makes it a "Constitution." Is that just the name that they chose, or is there another reason?