noun pl. obliquities -·ties

1. the state or quality of being oblique
2. an oblique statement, action, etc.
3. a turning aside from moral conduct or sound thinking
4. Astron. the angle between the planes of a planet's equator and its orbit about the sun: for the earth (obliquity of the ecliptic) it is currently c. 23° 26.5′ and will decrease at the rate of 0.47″ a year for c. 1,500 years, at which time it will begin to increase again
5. Math.
   1. deviation of a line or plane from the perpendicular or parallel
   2. the degree of this

Etymology: ME obliquitee < L obliquitas