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mainly

[meyn-lee] /ˈmeɪn li/
adverb
1.
chiefly; principally; for the most part; in the main; to the greatest extent:
Our success was due mainly to your efforts. The audience consisted mainly of students.
2.
Obsolete. greatly; mightily; abundantly.
Origin of mainly
1225-1275
1225-75; Middle English maynliche, maynly. See main1, -ly
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for mainly

mainly

/ˈmeɪnlɪ/
adverb
1.
for the most part; to the greatest extent; principally
2.
(obsolete) strongly; very much
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for mainly
adv.

late 13c., "vigorously," from main (adj.) + -ly (2). Meaning "especially" is from c.1400; that of "for the most part" is from 1660s.

Online Etymology Dictionary, © 2010 Douglas Harper
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