1. engage or engross the interest or attention of beforehand or occupy urgently or obsessively; "His work preoccupies him"; "The matter preoccupies her completley--she cannot think of anything else"
(hypernym) control, command
(hyponym) haunt, obsess, ghost
2. occupy or take possession of beforehand or before another or appropriate for use in advance; "the army preoccupied the hills"
(hypernym) assume, usurp, seize, take over, arrogate
(derivation) preoccupancy, preoccupation