Chief"ly (?), adv.
1.
In the first place; principally; preeminently; above; especially.
Search through this garden; leave unsearched no nook;
But chiefly where those two fair creatures lodge.
Milton.
2.
For the most part; mostly.
Those parts of the kingdom where the . . . estates of the dissenters chiefly lay.
Swift.
© Webster 1913.