aphno marks an event as occurring without advance transition in the scenes where it appears.

The attested uses mark happenings presented as unanticipated: a sound arrives from heaven, an earthquake occurs, and observers expect a man to fall dead.

1. An unanticipated occurrence or expected event · dominant

   In Acts 2:2 the adverb marks the arrival of a sound from heaven that fills the house; in Acts 16:26 it marks the earthquake that shakes the prison foundations and is followed by opened doors and unfastened bonds. In Acts 28:6 it qualifies the collapse the onlookers expected, though they later see nothing unusual; the APB renders these clauses with “suddenly.”

   Acts 2:2Acts 16:26Acts 28:6

In the Anselm Project Bible: The APB uses “suddenly” in each supplied verse: for the sound in Acts 2:2, the earthquake in Acts 16:26, and the expected fall in Acts 28:6. This reflects the clauses' presentation rather than a precise token-by-token mapping.