To me, a horse is "green" at anything that s/he is just being introduced to.
By that definition, a green broke horse is one that has learned that a saddle and bridle are not torture devices, a rider is not out to kill, and has learned basic gas, steering, and brake controls. To me, once those most basic respect and control skills are mastered and more complex movements and requests are being taught (i.e., leg yielding, rein back, TOF, TOH, etc.), the horse is starting to move away from "green" territory.
There is a pretty good size gray area, though, as I don't consider a horse "well broke" until s/he is showing some real willingness and even refinement in everything that every horse should know, or all the "nonspecialized" commands. WTC, transitions within and between gaits, quiet relaxed halt, willing rein back, TOF, TOH, balanced turn on center, leg yield, etc.
A horse might be considered to be "very well broke" to "finished" when s/he has a grip on more specialized skills for his/her discipline. For example, I'd expect a very well broke reiner to, in addition to all of the above, be able to spin, or a very well broke trail horse to handle reasonable water crossings easily.
By this outline, my fella would land in the gray area between "green broke" and "well broke." We have a good walk and trot, but his canter still needs work in terms of getting balanced and handy within the gait. We have a fair TOF and TOH that could use refinement, but they're coming. He's struggling with leg yielding, but that's slowly getting better. He's got too many miles under him and is too handy at WT to really be justified in still calling him "green," but he's got a ways to go before I'd be comfortable calling him "well broke," largely due to the amount of work his canter still needs.