preoccupation (n.)

• absentmindedness
• absorption
• abstractedness
• abstraction
• abulia
• adoption
• alienation
• anxiety
• apathy
• application
• appropriation
• arrogation
• assiduity
• assiduousness
• assumption
• bemusement
• claim
• colonization
• colony
• complex
• compulsion
• concentration
• conquest
• constancy
• contemplation
• contemplativeness
• daydream
• daydreamer
• daydreaming
• dejection
• dependency
• depression
• detachment
• diligence
• doggedness
• dream
• dreaming
• elation
• emotionalism
• endurance
• engagement
• engrossment
• enslavement
• euphoria
• fantasy
• fascination
• feud
• fidelity
• fiefdom
• fixation
• freehold
• hang-up
• hold
• holding
• hypochondria
• hysteria
• hysterics
• immersion
• indefatigability
• indent
• indifference
• industriousness
• industry
• insensibility
• insistence
• insistency
• intentness
• involvement
• lease
• leasehold
• lethargy
• loyalty
• mandate
• mania
• meditation
• melancholia
• melancholy
• monomania
• muse
• musing
• obsession
• obstinacy
• occupancy
• occupation
• owning
• patience
• pensiveness
• permanence
• perseverance
• persistence
• persistency
• pertinacity
• plodding
• possession
• preemption
• preoccupancy
• prepossession
• prescription
• property
• reflectiveness
• relentlessness
• requisition
• resolution
• reverie
• sedulity
• sedulousness
• single-mindedness
• socage
• speculativeness
• squatting
• stability
• stamina
• stargazing
• steadfastness
• steadiness
• stubbornness
• studiousness
• study
• stupor
• subjugation
• sublease
• submersion
• takeover
• tenaciousness
• tenacity
• tenancy
• tenantry
• tenure
• thoughtfulness
• tic
• tirelessness
• title
• trance
• twitching
• unresponsiveness
• usurpation
• wistfulness
• withdrawal
• woolgathering