Quite possibly Esperanto. And opendoor, ballroom is its own thing with its own goals and desired outcome, so words that mean one thing in ballroom probably aren't going to be relevant to club or swing or AT. Most American ballroom (ANY ballroom) stems out of the English school. That's where a lot of the terminology originates. And probably why ballroom has a lot more terms with commonly-accepted meanings. It's a competitive sport with a long history of being taught as such, hence even "street" dances like the Latin stuff getting codified and standardized so that there's some way both to teach it (not having a common vocabulary with accepted meanings makes effective teaching impossible) and to judge it, which has traditionally been the ultimate goal. More so as ballroom becomes less and less relevant as social dancing outside controlled studio settings.