continuative
Concise Oxford English Dictionary © 2008 Oxford University Press:
continuative /kənˈtɪnjʊətɪv/ Linguistics
▶adjective (of a word or phrase) having the function of moving a discourse or conversation forward. ▶noun a continuative word or phrase (e.g. yes, well, as I was saying).
'continuative' also found in these Oxford entries:

