Most generally-accepted audio term, for "pre" and "post" lengths of a symmetric filter's impulse response? Consider a FIR audio filter with symmetric impulse response.
In my case, the filter kernel width is 15 frames on each side (so including the center frame, 31 frames total).  When examining the audio impulse response of this filter, it includes (A) the initial interval where it approaches the center, then (B) the centered impulse output frame itself, then (C) the subsequent interval following the center.
I have seen numerous terms referring to intervals (A) and (C), including

(A) lookahead, ramp-in, processing delay, pre-echo, positive filter width, ring-in, pre-response;
(C) decay time, ramp-out, post-delay, negative filter width, ring-out, causal response.

... and many others.
In the audio world, is there a term that is considered most accurate and/or most clearly descriptive for these two intervals?
That's the causal (comes after the impulse) and anticausal part.