firstly

from WordNet (r) 3.0 (2006)

firstly
    adv 1: before anything else; "first we must consider the garter
           snake" [syn: {first}, {firstly}, {foremost}, {first of
           all}, {first off}]

from The Collaborative International Dictionary of English v.0.48

Firstly \First"ly\, adv.
   In the first place; before anything else; -- sometimes
   improperly used for first.
   [1913 Webster]

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