All 7 Uses

reflection
in
The Scarlet Letter
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Yet my reflections were not the most comfortable.
p. 38.7

reflections = thoughts
It had the graveyard, originally Isaac Johnson's home-field, on one side, and so was well adapted to call up serious reflections, suited to their respective employments, in both minister and man of physic.
p. 116.5
Sometimes a light glimmered out of the physician's eyes, burning blue and ominous, like the reflection of a furnace, or, let us say, like one of those gleams of ghastly fire that darted from Bunyan's awful doorway in the hillside, and quivered on the pilgrim's face.
p. 119.7 *

reflection = image (as shined back by a smooth surface)
While occupied with these reflections, a knock came at the door of the study, and the minister said, "Come in!"
p. 208.5 *

reflections = thoughts
It appalled her, nevertheless, to discern here, again, a shadowy reflection of the evil that had existed in herself.†
p. 88.4
Now, however, her interview with the Reverend Mr. Dimmesdale, on the night of his vigil, had given her a new theme of reflection, and held up to her an object that appeared worthy of any exertion and sacrifice for its attainment.†
p. 153.8
The dim reflection of a remembered splendour, a colourless and manifold diluted repetition of what they had beheld in proud old London—we will not say at a royal coronation, but at a Lord Mayor's show—might be traced in the customs which our forefathers instituted, with reference to the annual installation of magistrates.†
p. 215.4

Definitions:

(1) (reflection as in: my reflection in the mirror)
an image (seen on a mirror or other shiny surface)
(2) (reflection as in: lit by the reflection)
light seen after it bounces off a surface to another; or the process of bouncing light, sound, or other energy off of a surface
(3) (reflection as in: is a reflection of American values)
something that indirectly shows something else -- such as an indication, demonstration, expression, or representation of something
The exact meaning of this sense of reflection depends upon its context. For example:
- "The students' behavior is a reflection on the school." -- indication of quality
- "She says the immorality in the movie is a reflection of American values." -- expression or representation
- "It was a reflection of the selfishness she had seen growing for years." -- demonstration
- "The surrounding panic found no reflection in her." -- expression or demonstration
- "I saw no reflection of jealousy in her action." -- indication or sign
(4) (reflection as in: After reflection, I think...)
careful thought
(5) (reflection as in: a humbling reflection (memory))
memories and thoughts about them
(6) (meaning too rare to warrant focus)
See a comprehensive dictionary for less common meanings of reflection.