from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The process, chiefly involving constriction of the pupil, by which the eye adapts to an increase in illumination.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the process of adjusting the eyes to relatively high levels of illumination; the pupil constricts and the cones system is operative
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