order of aberration
order of aberration
[′ȯrd·ər əv ‚ab·ə′rā·shən] (optics)
The sum of the powers to which the field height and the pupil coordinates are raised in describing a term in the decomposition of an aberration according to the degree of dependence on these variables.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.