noun
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a going back; a retreat; withdrawal.
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a diverging from a common point in different direction; divergence.
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a keeping or moving aside.
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the act, fact or the process of spending time.
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a process, condition or period of decline, as in the status, position or fortune.
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a deviation from the normal path; a departure from what is right, true, correct, etc.; aberration.
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(phys.) non-convergence of rays, owing to a) difference in refractability of different colours; chromatic aberration; b) difference of focus of the marginal and central parts of a lens or mirror; spherical aberration.
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(astron.) an apparent displacement of a star owing to the finite ratio of the velocity of light to that of the earth.