I read the question WHY (actually) did Rosetta have to go into hibernation for 2.5 years? that uses the term attitude to refer to the orientation of the Rosetta probe:
It spun itself up to stabilize its attitude, then shut down navigation, attitude control, communication systems as well as some of the heaters
When I read the question, I thought it was a typo for altitude, but now I understand that attitude control refers to:
...controlling the orientation of an object with respect to an inertial frame of reference or another entity (the celestial sphere, certain fields, nearby objects, etc.).
My question is, what is the origin of using the word 'attitude' to refer to orientation?