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principally

[prin-suh-puh-lee, -sip-lee] /ˈprɪn sə pə li, -sɪp li/
adverb
1.
chiefly; mainly.
Origin of principally
1300-1350
1300-50; Middle English; see principal, -ly
Synonyms
primarily. See especially.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for principally

principally

/ˈprɪnsɪpə/
adverb
1.
mainly or most importantly
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for principally
adv.

mid-14c., "mostly, mainly; most importantly," from principal (adj.) + -ly (2). Late 14c. as "first of all." Meaning "for the most part" attested by 1832.

Online Etymology Dictionary, © 2010 Douglas Harper
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