duo marks a count of two, whether of people, objects, periods, or members of a pair.

The attested use consistently marks an exact count of two: people sent or present, physical items and amounts, periods of time, witnesses, and paired members considered together. The same numerical use appears when two are contrasted with another quantity or described as becoming one.

1. A count of two · dominant

   The adjective specifies two persons in actions and groups: in Acts 10:7 the APB renders the calling of “two of his servants,” and in Luke 10:1 it renders people being sent “two by two.” It also marks two items or units, as “two fish” in John 6:9, “two days” in John 11:6, and “two or three witnesses” in 1 Timothy 5:19. In Ephesians 5:31, the APB renders the pair who “shall be toward one flesh,” showing two members described together in that clause.

   Acts 10:7Luke 10:1John 6:9John 11:61 Timothy 5:19Ephesians 5:31

In the Anselm Project Bible: Across the supplied verses, the APB commonly presents the numerical force with “two,” including “two days,” “two fish,” and “two or three witnesses.” These English phrases confirm the verse-level count rather than independently defining the Greek term.