Adumbration

Adˊum-bra′tion

,

Noun.

[L.

adumbratio

.]

1.

The act of adumbrating, or shadowing forth.

2.

A faint sketch; an outline; an imperfect portrayal or representation of a thing.

Elegant

adumbrations

of sacred truth.

Bp. Horsley.

3.

(Her.)

The shadow or outlines of a figure.

,

Noun.

1.

The act of making a shadow or faint resemblance.

2.

A faint sketch; an imperfect representation of a thing.

3.

In heraldry, the shadow only of a figure, outlined, and painted of a color darker than the field.

adumbration ‎(plural adumbrations)

(obsolete, art) Shading.
A faint sketch; an outline, a brief representation.
(figuratively) A rough or symbolic representation of something.
- 1969, Vladimir Nabokov, Ada or Ardor, Penguin 2011, p. 238:
  The merest adumbration of an apology on Baron Veen's part would clinch the matter with a token of gracious finality.
(heraldry) The shadow or outline of a figure.
(literature) A vague indication of what is to come.