onstage - Wiktionary, the free dictionary

• on-stage, on stage

From on +‎ stage.

onstage (not comparable)

1. On the part of a stage that is visible to the audience.

onstage (not comparable)

1. Taking place on the part of a stage that is visible to the audience.

   • 2009, Jennifer Bringle, Lighting, page 23:

     The first is a special—a single lighting instrument that lights a particular spot on the stage. Specials generally have no color, or a more saturated color, allowing them to stand out through other lighting onstage.

• offstage

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