Etymology
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chiefly (adv.)

"pre-eminently, above all, in the first place," mid-14c., from chief (adj.) + -ly (2). Adjectival meaning "pertaining to a chief" is from 1870 (from chief + -ly (1)).

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Definitions of chiefly

chiefly (adv.)
for the most part;
Synonyms: principally / primarily / mainly / in the main
From wordnet.princeton.edu