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The phrase "are commonly defined as" is correct and usable in written English.
It can be used when explaining or clarifying the meaning of a term or concept that is widely accepted or recognized.
Example: "In the field of psychology, emotions are commonly defined as complex reactions that engage both the body and mind."
Alternatives: "are generally described as" or "are often characterized as".
Exact(35)
Both companies have roughly a third of the $55 billion market for regional jetliners, which are commonly defined as aircraft with 100 or fewer seats.
Progressive degenerative syndromes which affect brain, altering memory, behavior, cognition and emotion, are commonly defined as dementia.
Doris Kearns Goodwin, Douglas Brinkley and Richard Norton Smith, all of whom are commonly defined as such, appear frequently on television talk shows and write for op-ed pages.
Whitman writes that the discussion of such influences is almost taboo, because the crimes of the Third Reich are commonly defined as "the nefandum, the unspeakable descent into what we often call 'radical evil.' " But the kind of genocidal hatred that erupted in Germany had been seen before and has been seen since.
"Young people" are commonly defined as those between the ages of 10 and 24 years, but what it means to be a young person varies largely across cultures and depends on a range of socioeconomic factors.
Although acute heart failure syndromes are commonly defined as a change in chronic heart failure signs and symptoms requiring urgent therapy, the presentation, development, and response to treatment is highly dependent on individual patient characteristics.
Similar(25)
A cantilever is commonly defined as a beam or girder fixed at one end.
It is this rock breaking, which in Earth science is commonly defined as an earthquake.
Samadhi is commonly defined as a state of deep, spiritual concentration, leading to a sense of oneness with the universe.
Landscape fragmentation is commonly defined as having five distinct phases (perforation, dissection, subdivision, shrinkage, and attrition).
Preterm birth is commonly defined as any birth before 37 weeks completed weeks of gestation.
More suggestions(17)
are typically defined as
are commonly characterised as
are usually defined as
are traditionally defined as
are often defined as
are frequently defined as
are currently defined as
are customarily defined as
are commonly described as
are commonly identified as
are popularly defined as
are commonly designated as
are commonly repeated as
are commonly reported as
are commonly utilized as
are commonly addressed as
are commonly known as
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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