Don't know if there's an official definition anywhere, but to me a baulked landing is basically a go-around anytime from the flare onwards.
Further to what Whoops said, our company SOPs have changed so that after the 'minimums' or 'decision' or whatever call your company has, the PF replies 'continue' rather than 'land'. I think this is a good move to prevent people getting into the mindset that they must land after passing the missed approach point when a go-around would be appropriate.