Yes, this is because I am still waiting for you to indicate concurrence or otherwise with my two definitions. As soon as you do this we can then proceed to your latest request.Please, dear Nouveau, you have not yet determined to concur or not with my latest request for concurrence...
There is a beginning to some object or condition p iff there is some time t where p holds, and no time prior to t where p holds.
An infinite causal regress is where every event is an effect caused by some prior cause, such that there is no beginning to the sequence.
As someone who is into honest, intelligent, and productive thinking, I am sure you will address this without any further stalling or evasion.