I increasingly dislike the term"leftist", but generally if I want to use it meaningfully, I use it to mean "anti-capitalist" in the broadest sense, since that's the thing they have in common. Or at least it's supposed to be. Note that my definition excludes social democrats and other rad-libs who are often (in USA discourse at least) considered to be "on the left", or at least would self-identify as leftist, because they are not actually opposed to capitalism itself, but reformists of capitalism.
I increasingly dislike the term"leftist", but generally if I want to use it meaningfully, I use it to mean "anti-capitalist" in the broadest sense, since that's the thing they have in common. Or at least it's supposed to be. Note that my definition excludes social democrats and other rad-libs who are often (in USA discourse at least) considered to be "on the left", or at least would self-identify as leftist, because they are not actually opposed to capitalism itself, but reformists of capitalism.