Etymology
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mainly (adv.)

c. 1300, "vigorously, strongly, forcibly" (a sense now obsolete), from main (adj.) + -ly (2). Meaning "especially, chiefly, principally" is from c. 1400; that of "for the most part" is from 1660s.

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Definitions of mainly

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