[prin-suh-puh-lee, -sip-lee]
chiefly; mainly.

1300–50; Middle English; see principal, -ly

primarily. See especially. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
principally (ˈprɪnsɪpəlɪ)
mainly or most importantly

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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Example sentences
Antihistamines act principally by blocking the action of histamine at receptors
  located on the blood vessels in the nose.
Energy waves can be redirected or even split by several methods, principally
  refraction or mirroring.
And a lack of demand principally comes from household debt.
He was charged with failing to report gifts, principally in the form of
  renovations to a small house he owned.
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