I am in no way a dance expert. All of this is what I have picked up in my own experience- SMing dance and taking dance classes (which I highly recommend, in terms of improving dance vocabulary).
There are some good articles on Wikipedia relating to dance terms:
Ballet Glossary:
http://en.wikipedia.org/wiki/Glossary_of_balletIn case you're not only doing ballet:
http://en.wikipedia.org/wiki/Glossary_of_dance_moves A "Video Dictionary" of ballet terms:
http://www.abt.org/education/dictionary/index.htmlDepending on what kind of dance you're working on, some companies/styles of dance may have a vocabulary of their own. Modern dance has slightly different positions of the feet than ballet. Oftentimes I will ask someone in the company what a particular move or step is called.
The different ways that dancers describe movement are incredibly useful - in ballet, a turn can be described as "en dedans" or "en dehors"- basically inside and outside turns, and sometimes dancers will talk about "homolateral movement" vs "contralateral movement"- homolateral has you using the same arm as leg (e.g. right arm with right leg), while contralateral uses opposite arm and leg (right arm with left leg).
I will also write things down in a hurry and make up descriptions for things I don't know, and fix them later. Or draw a picture.
What kind of dance were you doing?