Sentence Yes "oneness" is a correct and usable word in English.
It is usually used to refer to harmony, unity or mutual understanding between two or more people or groups. For example, "The oneness the two tribes experienced after they settled their dispute was remarkable."
Also Kindian is the effort to accommodate Islamic monotheism, by insisting on the oneness and willful action of God, and by adopting the Porphyrian theme of the harmony between Aristotle's and Plato's teaching.
And in the Tevijja Sutta (D I.235 52), the Buddha rejects the claim of certain Brahmins to know the path to oneness with Brahman, on the grounds that no one has actually observed this Brahman.
For the claim that the relevant form is not one contradicts Oneness, the claim that every form is one.
In contrast to Stace, R. C. Zaehner identified three types of mystical consciousness: (1) a "panenhenic" extrovertive experience, an experience of oneness of nature, one's self included, (2) a "monistic" experience of an undifferentiated unity transcending space and time, and (3) theistic experience where there is a duality between subject and the object of the experience (Zaehner, 1961).
The principal symptom of this malady is the loss of "the perception [Anschauung] of the true totality, of oneness and life in one unity" (GTU 264/66).
Muslims do not differ on essentials such as the oneness of God, the literalness of his word as voiced by Muhammad, or the duty to perform prayer, charity, fasting, pilgrimage and jihad, which means something like "struggle".
Another Indian walks past, "ramrod straight, even leaning slightly backward"; a cowboy talks of the "oneness" he feels when out on the range, and how the cattle, to him, move with all the fluidity of birds or schools of fish.
Here, questioning this practice and the consequences it entails, Zen instead speaks of mind-body oneness, an holistic perspective, as it abhors one-sidedness.
Although this interpretation makes sense of the epistemic language that Plato sprinkles throughout the Third Man passage, it does not make sense of the fact that Parmenides sets up the argument by pointing out that the oneness of the large follows from its being one "over" many large things (see above).
Moreover, D2 contains an argument for the claim that if the one is, then there are infinitely many forms of oneness.
The above works, all of which are continuations of Ṣadrian philosophy, further elaborate the fine points of transcendentalist theo-sophy, which was firmly based on the principality of existence over essence, gradation, and the oneness that appears as multiplicity.
