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Discover LudwigThe part of a sentence "was firstly" is grammatically correct and can be used in written English.
It is often used to indicate the first in a series of events or ideas. For example: "Tom's first thought was firstly to apologize to his friend for his behavior."
Dictionary
was firstly
adverb
In the first place; before anything else; first.
Exact(60)
What surprised us was firstly the resilience of the energy prices, which we didn't expect to rise so much".
Construct validity was firstly analyzed.
A CSA was firstly presented.
This phenomenon was firstly proposed in [35].
This method was firstly proposed in [14].
It was firstly defined in [36].
The site observation was firstly briefed.
Aniline was firstly distilled under reduced pressure.
(WVVI) was firstly introduced by Giannessi [1].
The diffusion layer model was firstly developed.
It was firstly introduced by Von Neumann and Morgenstern [21].
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com