Duet
A piece of music intended for two people to play simultaneously.
Voluntary
An action done by choice
Enactment
Acting out (often a performance) or passing legislation into law.
Accredit
To recognize as meeting official standards
Duality
Bene / Malevolent
A characteristic of a person who desires to do good / bad.
Actionable
Incredulous
Being unwilling or unable to believe something
Duplicity
deceitfully acting in two different ways to different people. Commonly associated with fraud.
Volition
The power/ability to make one's own choices; the will to make one's own decisions.
Releasing or express repressed emotions (often through reliving a tramatic moment)
Miscreant
A person who behaves badly, breaks the law, or acts immorally