Adverb
bidirectionally (not comparable)
In opposite directions.
A B-frame can contain any number of intra-coded blocks and forward-predicted blocks, in addition to backwards-predicted, or bidirectionally predicted blocks. Source: Internet
It has been hypothesized that the recruitment and initiation of RNA Polymerase II usually begins bidirectionally, but divergent transcription is halted at a checkpoint later during elongation. Source: Internet