The phrase 'primary entity' is correct and usable in written English.
You can use it when referring to a subject that is of major importance within a particular context. For example: "The primary entity of this analysis is the relationship between the economy and the environment."
It is formally charged in the government's National Response Plan as a primary entity responsible for coordinating emergency shelters and other aspects of victim care during disasters.
Cleveland's police department, the primary entity in charge of maintaining public safety while allowing demonstrators to exercise their constitutional rights, has been operating since June, 2015, under a consent decree with the Department of Justice.
I have already quoted a passage in which Scotus correlates the nature's less than numerical unity with its primary entity or being.
Table 1 summarizes the primary entity types applied in the annotation.
Although fA β was thought to be the primary entity responsible for AD, recent evidence suggests that soluble oligomeric amyloid β (oA β) found in the cortex of AD patients contributes to the pathogenesis of AD.
However, the significance of these studies is unclear since these findings could suggest either a primary entity or secondary to chronic use of laxatives and/or behavioral changes of constipated patients through the years.
Cloud providers and consumers are the two primary entities in the business market.
To enable that curation effort, DSSTox has three primary entities, each labeled with a permanent intransient DSSTox Identifier.
In addition to the two primary entities, namely, cloud service providers (CSPs) that offer software applications, platforms or infrastructure for their cloud consumers, other roles have emerged.
The nation state is the primary democratic entity that remains.
The nation state is still the primary democratic entity; but given the scale of globalisation it is clearly no longer up to the that task of meeting the needs of its citizens.
