in the first place; first.

1525–35; first + -ly Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
firstly (ˈfɜːstlɪ)
coming before other points, questions, etc

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

1530s, but never a common word (simple first usually serving its place), from first + -ly (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Firstly, for those of you wondering, this is a little sad.
Firstly, the condition is know as global climate change not global warming.
OK, firstly, the pay is bad compared to the rest of the world.
Firstly, you never receive an acknowledgement to your application and you never
  know how long should you wait.
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