"adequate notion" is correct and usable in written English.
You can use it to refer to an idea that is considered to be sufficient or satisfactory. For example, "His explanation of the situation provided an adequate notion of what had happened."
In Hegel's view, Greek philosophy had attained an adequate notion of substance yet for historical reasons had fallen short of the modern concept of subjectivity.
Conversely, modern philosophy, beginning with Descartes, appreciated the value of subjectivity as a philosophical starting point but failed to develop an adequate notion of objective truth.
A more adequate notion of necessary being is that the necessity is metaphysical or factual.
Given this semantical machinery, Tarski can solve in the negative the problem of the existence of (a formal counterpart of) a universal language, i.e., one where it is possible to define an adequate notion of truth for the same language.
From 1917, Łukasiewicz had been happy with the three-valued logic as formulating adequate notions of modality, with the noted preference for the infinite-valued system as optimally precise.
In this regard, it's noteworthy that Justice DeGrasse's order endorsed the notion of "adequate," rather than "equal" funding -- an idea that advocates for school-finance reform have advanced for 10 years.
This description is unsatisfactory in that no adequate definition of the notion syllabic has yet been formulated.
There's been a bit of backlash about the new "L" word — local — by some economists, most pushers of industrial agriculture and other skeptics, who scoff at the notion that adequate amounts of food can be grown locally.
All three theses require an adequate clarification of the notion of a basic physical part.
Likewise, and as acknowledged in various international treaties, adequate housing incorporates the notion of location and accessibility (see below).
This account is intuitive, but perhaps it cannot be treated as a formally adequate definition of the notion of primary substance or individual.
