chief•lyPronunciation: (chēf'lē), [key]
primarily; essentially: He phoned chiefly to let us know he was feeling better.
mainly; mostly: This dish consists chiefly of noodles.
of, pertaining to, or like a chief: his chiefly responsibilities.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.