Noun
The act of adumbrating, or shadowing forth.
A faint sketch; an outline; an imperfect portrayal or representation of a thing.
The shadow or outlines of a figure.
Source: Webster's dictionaryEverything that happens in the Old Testament is a "type" or adumbration of something that happens in the New Testament, and the whole subject is therefore called typology, though it is a typology in a special sense. Northrop Frye
In modern times the belief that the ultimate explanation of all things was to be found in Newtonian mechanics was an adumbration of the truth that all science, as it grows towards perfection, becomes mathematical in its ideas. Alfred North Whitehead