n. Any action, carried out onstage during a performance, apart from the main action.
the GNU version of the Collaborative International Dictionary of English
n. Action carried on aside, and commonly in dumb show, while the main action proceeds.
The Century Dictionary and Cyclopedia
n. In a play, action carried on aside, and commonly in dumb show, while the main action proceeds; action not intended to be observed by some of the persons present.
n. A diversion; something apart from the main purpose.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. incidental activity performed by an actor for dramatic effect
Word Usage
"They're watching for Baker and his byplay with the suspects and co-star Robin Tunney — and for a show that, while not a great drama, is a terrific antidote to tough times."