Concurrent (12)
I believe the answer is:
simultaneous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concurrent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for simultaneous that I've seen before include "absolutely together" , "Done at the same time" , "Occurring at same time" , "Happening at the same time" , "Occurring together" .)