Definition of difference has definitions from the field of mathematics 1 [ noun ] the quality of being unlike or dissimilar Examples : "there are many differences between jazz and rock" Used in print(The Christian Science Monitor,...) You definitely hear some of the instruments close_up and others farther back , with the difference in placement apparently more distinct than would result from the nearer instruments merely being louder than the ones farther back . (High Fidelity, 11:10...) This difference is made_up of many factors . (Edward Austin Walton, "On Education for the Interior...) We may then dismiss the time difference between these courses and the usual four year course of the interior_design student as not having serious bearing on the subject . (Tristram P. Coffin, "Folklore in the American Twentieth...) Does the writer know the difference between an `` ersatz '' ballad or tall_tale and a true product of the folk ? (Frank Getlein and Harold C. Gardiner, S.J., Movies,...) The `` moving '' picture of the train or the wave coming at the audience is , to_be_sure , more intense than a still picture of the same subject , but the difference is really one of degree ; the cinematic element of time is merely used to increase the realism of an object which would still be reasonably realistic in a still photo . 2 [ noun ] (mathematics) a quantity obtained by subtraction Synonyms Examples "profit is a positive difference between income and expenses" Used in print(Harry H. Hull, "The Normal Forces and Their Ther...) The concept of the strain energy as a Gibbs function difference * * f and exerting a force normal to the shearing face is compatible with the information obtained from optical birefringence studies of fluids undergoing shear . If a is the major_axis of an ellipsoid and b and c are the other two axes , the radius_of_curvature in the ab plane at the end of the axis is * * f , and the difference in pressure along the a and b axes is * * f . If it is assumed that the formula given by Lodge of * * f , cosec 2lc applies , the pressure difference along the major_axes can be calculated from the angle of inclination of the major_axis , and from this the interfacial_tension can be calculated . (Francis J. Johnston and John E. Willard, "The...) It was possible to make estimates of the quantum yield by observing the extent of reduction of a uranyl_oxalate actinometer solution illuminated for a known time in a typical reaction cell and making appropriate conversions based on the differences in the absorption_spectra of uranyl_oxalate and of chlorine , and considering the spectral distribution of the light source . (S. Idell Pyle, et al., Onsets, Completions, and...) Although the standard_deviation values on which spread of the lines are based are relatively larger for those centers which begin to ossify early ( Table 1 ) , there are considerable differences in this value between centers having the closely timed Onsets . 3 [ noun ] a variation that deviates from the standard or norm Synonyms Examples "the deviation from the mean" Used in print(M. Yokoyama et al., "Chemical and serological...) There appeared to be no difference in the distribution of anti - A and anti - B activity in group O serum , though in two group O donors ( J._F. and E._M. ) only one type of agglutinin was found in the regions of low anionic binding capacity ( Figs. 1 and 2 ) . (Richard F. McLaughlin, et al., "A study of the...) It is evident that many marked and striking differences exist between lungs when an inter-species comparison is made . Although Miller noted in 1907 that a difference in the pleural blood supply existed between animals , nowhere in his published works is it found that he did a comparative study of the intrapulmonary features of various mammalian lungs other_than in the dog and cat ( Miller , ' 13 ; ' 25 ) . (S. Idell Pyle, et al., Onsets, Completions, and...) The difference between the sequence of Onset of ossification for the sexes governs the numbering sequence in Figures 3 and 4 . This difference is readily clarified by referring to Table 1 . Related terms 4 [ noun ] a disagreement or argument about something important Synonyms Examples "he had a dispute with his wife" "there were irreconcilable differences" "the familiar conflict between Republicans and Democrats" Used in print(Douglas Ashford, "Elections in Morocco: Progress...) In the new country the electoral process is considered as a means of resolving fundamental , and sometimes bitter , differences among leaders and also as a source of policy guidance . Related terms 5 [ noun ] a significant change Examples "the difference in her is amazing" "his support made a real difference" Used in print(Edwin Booth, Outlaw Town....) Maybe if the marshal hears this himself , it 'll make a difference . Related terms *