Basic Guidelines For English Spellings
READ THESE ARTICLES
Responsive; replying, responding.
Late Middle English (in an earlier sense). From Anglo-Norman and Middle French responsal answering, that constitutes a response and its etymon post-classical Latin responsalis (in liturgy) that constitutes a response, responsorial, responsive, written in answer, answerable, responsible from classical Latin respōnsāre to reply (frequentative formation from respondēre) + -ālis.