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The phrase "are defined as either" is correct and usable in written English.
It can be used when explaining or categorizing concepts, terms, or classifications in a clear manner.
Example: "In the study of biology, organisms are defined as either prokaryotic or eukaryotic based on their cellular structure."
Alternatives: "are categorized as either" or "are classified as either".
Exact(17)
More specifically, they are defined as either thermoplastic resins or thermosetting resins.
Leukemias are defined as either acute or chronic and as either myelogenous (from bone marrow) or lymphocytic (involving lymphocytes).
Baghdad, like Kirkuk and Diyala, was split, like the neighborhoods that even now, despite improved security, are defined as either Sunni or Shiite, separated by checkpoints and blast walls that outsiders are wary to pass.
Lacking a union shop or a closed shop, workplaces are defined as either agency shops (which require employees to contribute funds equal to union dues but not join the union) or open shops (which require neither membership nor dues payment).
Since conventional engineering economic analysis involves uncertainty about future cash flows where cash flows are defined as either crisp numbers or risky probability distributions, the results of analysis may obscure.
Blue moons are defined as either the fourth full moon in a season, or, more recently, as the second full moon in a month.
Similar(43)
We are at a crossroads in modern Russian history that will be defined as either post-communist or post-democratic.
VILI was defined as either death or edema.
Mortality was defined as either hospital or day-28 mortality.
TBI-type was defined as either blunt or penetrating.
LV dysfunction was defined as either LV systolic or diastolic dysfunction, or both.
More suggestions(16)
are described as either
are designated as either
benefit defined as either
are identified as either
were identified as either
are expressed as either
are characterized as either
are classed as either
are labeled as either
are classified as either
are categorized as either
identifying as either
are defined as
are defined as being of
is classified as either
determined as either
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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