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Definition of deviation : 1. The act of deviating; a wandering from the way; variation from the common way, from an established rule, etc.; departure, as from the right course or the path of duty.
2. The state or result of having deviated; a transgression; an act of sin; an error; an offense.
3. The voluntary and unnecessary departure of a ship from, or delay in, the regular and usual course of the specific voyage insured, thus releasing the underwriters from their responsibility.

Synonyms:

deflexion, passing, aside, abacus, algorithm, release, loss, average, iniquity, approach, deviance, approximation, dispute, detour, villainy, deviancy, good, parenthesis, binomial, collision, remainder, decadence, excursus, immorality, calculation, unnaturalness, warp, enormity, leaving, going, diversionary attack, evil, a world of difference, usual, difference of opinion, irrelevancy, expiration, disagreement, bending, depravity, exit, excess, preternaturalness, wrong, divagation, diversion, tangent, going away, excursion, divergency, aberrancy, countdown, computational, recreation, sin, decimal place, correct

discrepancy, distinction, clash, inequality, mismatch, distinctness, counterpoint, dissimilarity, variance, conflict, disparity, disunity, non-uniformity, contrast, diversity, variety, contradiction, asymmetry, dissemblance

refraction, digression, shift, variation, diffraction, drift, departure, deflection

discord, disaccord, multifariousness, diverseness

curiosity, impropriety, idiosyncrasy, incongruity, freakishness, quirkiness, eccentricity, inconsistency, incompatibility, oddity, strangeness, divergence, unfamiliarity, peculiarity, aberrance, nonconformity, derangement, uniqueness, outlandishness, difference, anomaly, aberration, singularity, uncommonness, irregularity, unconventionality, exception, abnormality, funniness

adjustment, transfiguration, diversification, transformation, transposition, adaptation, alteration, mutation, revision, transition, modulation, metamorphosis, reformation, change, conversion, modification

perversion

deviousness, angularity, leaning, inclination, indirection, slant, bent, bias, slope

Usage examples:

• By this last deviation of Euphemia from truth, you may form an estimate how far the rest she has alleged deserves credit." - "Thaddeus of Warsaw", Jane Porter.
• This running off on a by- road is no deviation from Sir Willoughby Patterne and Miss Clara Middleton. - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
• 229. " A Figure of Syntax is an intentional deviation from the usual construction of a word." - "The Grammar of English Grammars", Goold Brown.