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Discover LudwigThe word 'unidirectionally' is correct and can be used in written English
It is an adverb that means "in a single direction" or "only in one direction". It is often used in technical or scientific contexts to describe processes or movement that occurs in one direction. Example: The flow of electricity in a circuit is unidirectionally controlled by the switch.
Dictionary
unidirectionally
adverb
In a single direction; in a unidirectional fashion
Exact(4)
Phosphorus and the other nonvolatile elements move unidirectionally from land, through aquatic environments, into ocean sediments.
The rest of the time, the Fellowship and the plot itself simply drift unidirectionally across a vast, undulating plain, pausing for the odd sword-clashing punch-up.
Friends are confirmed unidirectionally, so that anyone can claim any user as a friend, and guest books on profile pages are open to strangers.
It may also be in the sense of a point of origin for the transfer of information: the central dogma of molecular biology, which represents a 1950s reformulation of Weismannism in terms of information theory, asserts that information travels unidirectionally from nucleic acids to protein, and never vice versa.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com