demon
daimonion identifies beings described as entering people, speaking or acting, and being cast out.
The term consistently names beings portrayed as entering or affecting people and being expelled, while other verses depict them as believing, speaking, receiving sacrifices, or being associated with teachings and signs. It can also occur in accusations that someone “has” such a being.
Senses in use
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Beings that enter, affect, and are expelled · dominant
The dominant usage places the noun in accounts of expulsion from people. In Luke 8:30 the APB renders many such beings as having entered a man; in Luke 8:33 they come out of him and enter pigs, and in Mark 7:29 the nominative singular is rendered as having gone out of a daughter. The same pattern appears where expulsion is exercised as authority in Luke 9:1 and where a being throws down and convulses a child in Luke 9:42.
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Being attributed to a person in an accusation · common
In several accusations, the singular accusative form occurs in statements that a person “has” such a being. In John 7:20 the APB renders the crowd’s charge, “You have a demon,” while John 8:49 records a direct denial of that charge; Luke 7:33 applies the same accusation to John the baptizer.
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Plural beings in teaching, worship, and action · occasional
Plural forms occur beyond healing scenes: James 2:19 says that they believe and shudder, 1 Corinthians 10:20–21 places sacrifices and participation in contrast with God, and 1 Timothy 4:1 refers to teachings associated with them. Revelation 16:14 describes spirits of these beings doing signs, while Acts 17:18 reports an accusation that Paul proclaimed foreign deities.
In the Anselm Project Bible: The APB regularly renders the term as “demon” or “demons,” especially in clauses about entering, leaving, or being expelled. In accusation scenes it renders the larger statement as someone having a demon; Those English phrases describe the clause rather than a fixed rendering of each form.