Definition of "Sitting" :
noun: the act of assuming or maintaining a seated position
"He read the mystery at one sitting."
noun: (photography) the act of assuming a certain position (as for a photograph or portrait)
"He wanted his portrait painted but couldn't spare time for the sitting."
noun: a session as of a legislature or court
noun: a meeting of spiritualists
adjective: (of persons) having the torso erect and legs bent with the body supported on the buttocks
adjective: not moving and therefore easy to attack
"A sitting target."