Basic Guidelines For English Spellings
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Bending aside or in an oblique direction; movement away from a straight line, position, or course; an instance of this.
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From post-classical Latin obliquation-, obliquatio action or effect of slanting (late 2nd century in Tertullian), strabismus from classical Latin oblīquāt-, past participial stem of oblīquāre + -iō.