[M]ost Zionists use the term to describe not the expansionist desire to control the entire biblical land of Israel, but the more modest claim that there should be a Jewish national home within historic Palestine. That’s all Zionism amounts to. As to the exact size and shape of that home, prescriptions vary from one Zionist to another. -Jonathan Freedland, via.As the kids say, this. Even if you think Israel should be a Jewish city-state composed of Tel Aviv and no more, you are what's known as a Zionist. (If you think one pebble is enough, maybe not?)
Read the whole thing. That x100 if you're a Zionist who reads this and is reminded, ugh, that's what people think I believe.
Anyway, unlike Freedland, I do use "Zionist." I don't generally modify it with "left-wing," say, because while I'm somewhere on the left of the Zionist spectrum, this would imply less about my views on borders than, I fear, my feelings on Israeli socialism vs. capitalism, which is another issue entirely, and something I think Israelis can sort out for themselves.