aikidoc

"The way I use the terms, omote does not equal irimi, and ura does not equal tenkan. Omote/ura for me are locative descriptors, while irimi/tenkan are movement (footwork) descriptors. I can do irimi to uke's omote and ura; likewise, I can use tenkan into uke's omote and ura."

I agree Jun, Omote and Ura are locations or places-how you get there may be via irimi or tenkan. I view irimi and tenkan as ways to move. That is the same with uchi and soto-locations to me. One can move to the front, back, inside or outside using irimi and tenkan. THe other movement patterns to me are tenkai and hanten.