https://en.wikipedia.org/w/index.php?oldid=1276887484#Langua...
When you can't eliminate bias completely, as I think it is the case here, the next best thing is transparency, and you can hardly get better than that! Maybe no other dictionaries or encyclopedias describe it like that, but no other dictionaries or encyclopedias give so much detail on why it is described the way they do.
In the end "Zionism" is just a word, the meaning of it is what people make it to be, not what dictionaries or encyclopedias say it is, and considering the current situation, it means different things if you ask different people, so bias is unavoidable. Of course, if it is etymology you are after, the Wikipedia article covers that too, with plenty of citations.