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.
Obsolete. greatly; mightily; abundantly.

1225–75; Middle English maynliche, maynly. See main1, -ly Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mainly (ˈmeɪnlɪ)
1.  for the most part; to the greatest extent; principally
2.  obsolete strongly; very much

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 13c., "vigorously," from main (adj.). Meaning "For the most part" is from 1660s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Milk had been part of our one-block feasts from the start-mainly for cheese.
Loopers are somewhat difficult to detect since they feed mainly at night and
  hide in older vegetation during the day.
Seems there is no single definitive source, mainly due to absence of
  comprehensive research.
The municipality added that the surplus resulted mainly from.
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