The phrase "a single entity or" is correct and usable in written English.
It can be used when discussing the nature of something that is considered as one unit or individual, often in contrast to multiple entities.
Example: "In this analysis, we will treat the organization as a single entity or a collective group of individuals working towards a common goal."
Alternatives: "a solitary unit or" or "one distinct entity or".
The clinical and scientific literature overwhelmingly deals with fibroids as a single entity or disease.
So you cannot negotiate with a single entity or a single point of contact.
Here we investigated whether a single motif presented in two voices is encoded as a single entity or two separate entities, and whether motifs overlapping in time impede or enhance encoding strength.
WASHINGTON — Lawyers for the National Football League and an apparel company staked out aggressive positions at a Supreme Court argument Wednesday over whether the league should be treated as a single entity or a collection of 32 independent companies for purposes of the antitrust laws.
By Nick Paumgarten July 14, 2011 The bond market, if you can speak of it as a single entity (or as, say, an iron-willed reincarnation of James Carville), has so far chosen to call the bluffs of the various brinksmen and brinkswomen in Washington who have so far failed to come to an agreement to raise the debt ceiling and thereby to avert a global economic "calamity," to use Ben Bernanke's word.
The bond market, if you can speak of it as a single entity (or as, say, an iron-willed reincarnation of James Carville), has so far chosen to call the bluffs of the various brinksmen and brinkswomen in Washington who have so far failed to come to an agreement to raise the debt ceiling and thereby to avert a global economic "calamity," to use Ben Bernanke's word.
The notion that a single entity, supernatural or human, or that any one belief system can make things right seems to me to belong in the realm of cults, the impossibly romantic, the too-good-to-be-true diet, or stock tips.
Likewise, we could at the same time consider developmental changes that occur over the lifetime of a single entity, organic or inorganic (e.g., Mick Jagger or a '64 Corvette), as it undergoes age-related changes in its life history passage.
But it is not a single entity, politically or economically.
And it's not restricted to a single entity, state or nonstate entity".
A major difference of our work compared to these previous studies is the problem formulation: In [10, 11] a prediction is made for a single entity (nanomaterial or compound), and descriptors for the compounds/nanomaterials are given.
