"absorbed in thought, meditative," 1823, past-participle adjective from preoccupy (v.) in the "absorb mentally" sense. Earlier it meant "occupied in advance."
a preoccupied frown
got no help from his wife who was preoccupied with the children
prentice
prenup
prenuptial
preoccupancy
preoccupation
preoccupied
preoccupy
pre-op
pre-ordain
pre-order
pre-owned
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