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One should first use the tool which...

Is it right in using the word "first"?

Both firstly and first seem to have the same adverbial meaning.

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    First, the way you have used first in that opening sentence is perfectly fine. Second, I believe the issue regarding the use of second or secondly is even more tricky than first and firstly. There is some good reading about this at this ELU question. – J.R. Aug 2 '13 at 9:40
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Yes, that phrase sounds perfectly fine.

I've never actually heard or used the word "firstly". This says that Chicago Manual of Style and other style guides recommend against using it. It sounds old and overly formal.

(It might be used in British English, but I am not British, so I don't know.)

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