I agree it's common these days for "tactical" to be equated with "military," "survival," or "ninja cool." For me, to be tactical a piece of equipment must be practical, functional, simple, and foolproof as an anvil.
Another aspect of the tactical label, for me at least, is whether the knife is being used for its designed purpose. If I'm in the wilderness for a couple of weeks, a tactical knife would likely be fairly large. If I'm at work, in my office, then tactical is a small folder that fits in my pocket and has 2-3 blades. If I'm an accomplished whittler, then to me a tactical knife would likely be something very specifically designed for carving. I would call a filet knife tactical if being used to dress a fish, but not if I'm trying to carve wood with it. Anyway, that's my take on this "tactical" label.