One of the mysteries of the English language finally explained.
Everyone, all: used as a stage direction to indicate that the following words or lines should be spoken by all actors present, except (where applicable) those actors to whom they are replying or responding.
Late 15th century; earliest use found in The Towneley Plays. From classical Latin omnēs all people, use as noun of masculine plural of omnis (adjective) all, every.
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