three rounds

Dear Jim, I studied the Co to the Kindred Sayings V, Kindred Sayings about
the Truths, ch 2, Setting in Motion the Wheel of Dhamma, but I only have it
in Thai. There are three rounds: sacca ~naa.na, kicca  ~naa.na and kata
~naa.na. Now, I am writing about this, but I was wondering about the Pali
word for round. I cannot find a good translation for this, the English round
is not so clear. It would be very helpful if you could give me just the Pali
for this word.Is it va.t.ta? Thank you very much. Nina.