1) Absence 2) Absentmindedness 3) Abstractedness 4) Hobbyhorse 5) Ideefixe 6) Pensiveness 7) Preoccupancy 1) An act of preoccupying 2) French word used in English 3) Idea 4) Thought 
• (n.) Anticipation of objections. • (n.) The act of preoccupying, or taking possession of beforehand; the state of being preoccupied; prepossession.
Pre·oc`cu·pa'tion noun [ Latin praeoccupatio : confer French préoccupation .] 1. The act of preoccupying, or taking possession of beforehand; the state of being preoccupied; prepossession. 2. Anticipation of objections. [ R.] South. 
[n] - an idea that preoccupies the mind and holds the attention 2. [n] - the mental state of being preoccupied by something
preoccupancy noun the mental state of being preoccupied by something
the state of being preoccupied. · an act of preoccupying.