Improvisation — the act of inventing music, the words in a play, a statement, etc. while you are playing or speaking, instead of planning it in advance; something that is invented in this way
Barrier — a problem, rule or situation that prevents somebody from doing something, or that makes something impossible
Shyness — the feeling of being nervous or embarrassed about meeting and speaking to other people
Deep breath — to take a lot of air into the lungs
Mindfulness — a mental state achieved by concentrating on the present moment, while calmly accepting the feelings and thoughts that come to you, used as a technique to help you relax
Respond — to do something as a reaction to something that somebody has said or done
Speak up — to speak in a louder voice so that people can hear you
Spontaneously — in a way that is not planned but done because you suddenly want to do it
Performance — the act of performing a play, concert or some other form of entertainment
Character - a person or an animal in a book, play or film
Incorporate - to include something so that it forms a part of something
Beat - to defeat somebody in a game or competition
Audience - the group of people who have gathered to watch or listen to something (a play, concert, somebody speaking, etc.)
Tool - a thing that helps you to do your job or to achieve something
Set - a place where a play is performed or part of a film is filmed
Audition - a short performance given by an actor, a singer, etc., so that somebody can decide whether they are suitable to act in a play, sing in a concert, etc.
Definition of improvisation from the Oxford Advanced Learner's Dictionary[