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                                        :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.