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From The Collaborative International Dictionary of English v.0.48:
Obliquity \Ob*liq"ui*ty\, n.; pl. Obliquities. [L. obliquitas: cf. F. obliquit['e].] 1. The condition of being oblique; deviation from a right line; deviation from parallelism or perpendicularity; the amount of such deviation; divergence; as, the obliquity of the ecliptic to the equator. [1913 Webster] 2. Deviation from ordinary rules; irregularity; deviation from moral rectitude. [1913 Webster] To disobey [God] . . . imports a moral obliquity. --South. [1913 Webster]