1. adjective
a) Not erect or perpendicular; neither parallel to, nor at right angles from, the base; slanting; inclined.
b) Not straightforward; indirect; obscure; hence, disingenuous; underhand; perverse; sinister.
2. noun
a) An oblique line.
b) The punctuation sign "/"
3. verb
a) To deviate from a perpendicular line; to move in an oblique direction.
b) To march in a direction oblique to the line of the column or platoon; — formerly accomplished by oblique steps, now by direct steps, the men half-facing either to the right or left.
Wikipedia foundation.