A person or entity that acts together with another; a fellow performer or collaborator in a shared action or project.
From 'co-' (together) + 'actor' (a person who performs). Following the pattern of co-worker, co-author, and co-pilot, this term uses the prefix to indicate shared participation.
In theater and film, 'coactor' has largely been replaced by just listing actors, but in biology a 'coactor' describes molecules that work together—the same word serves different scientific communities.
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