Definition of in no small part
: to a great degree : largely or mostly The team's success is due in no small part to the hard work of its players.
Was in no small measure?
Definition of in no small measure
: to a great degree : largely or mostly Our success is due in no small measure to your support.
Was in large part due to?
: not entirely but mostly : largely The success of the play was in large part due to the director.
