c. 1600, "act of making a part of," from Latin inclusionem (nominative inclusio) "a shutting up, confinement," noun of action from past participle stem of includere (see include). Meaning "that which is included" is from 1839.
he admired the inclusion of so many ideas in such a short work
an inclusion in the cytoplasm of the cell
incline
inclined
inclose
inclosure
include
inclusion
inclusive
incogitable
incognito
incognizant
incoherence
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