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"was originally defined" is correct and usable in written English.
You can use this phrase to describe something that has been defined in the past but may have changed since then. For example: The term "social media" was originally defined as the use of web-based and mobile technologies to turn communication into interactive dialogue.
Exact(60)
Community-supported agriculture was originally defined by a very particular relationship between a farm and its customers.
The history: The kilogram was originally defined as being equivalent to the mass of a liter of water.
Glycolysis, the breakdown of sugar, was originally defined about 1930 as the metabolism of sugar into lactate.
These geometrical specifications are based on a tolerancing system, which was originally defined for the function mating capability.
The notion of regularity for fractional factorial designs was originally defined only for two-level factorial designs.
Competency was originally defined in the 1590's as "sufficiency to satisfy the wants of life," borrowed from the Latin word competentia.
This unit was originally defined as 100/27,316 of the triple point (equilibrium among the solid, liquid, and gaseous phases) of pure water.
Distinct, but devoid of much complexity (until now!), whiteness in America was originally defined only in opposition to — and implicitly and explicitly valued over — being brown or black.
The astronomical unit was originally defined by observations of the mean radius of Earth's orbit but is now defined as 149,597,870.7 km (about 93 million miles).
It was originally defined as a one-sixth-pound candle of sperm wax, burning at the rate of 120 grains per hour.
The passive house (PH) standard was originally defined for Central Europe and has subsequently been applied to many cold climate countries.
More suggestions(17)
was basically defined
was originally described
was originally characterised
was originally refined
was historically defined
was firstly defined
was originally confined
was first defined
was originally examined
was previously defined
was originally outlined
was primarily defined
was originally decided
was originally determined
was already defined
had initially been defined
are initially defined
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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