What is the term used to describe an actor's ability to immerse themselves in a character?

The term that best describes an actor's ability to immerse themselves fully in a character is concentration. In the context of acting, concentration refers to the intense focus and mental discipline an actor employs to embody their character authentically. This mental state allows actors to remain in character and respond truthfully to the stimuli within the performance context. Concentration can include the awareness of emotions, physical actions, and the reactions of other characters, fostering a genuine portrayal that resonates with the audience.

The other options do have connections to acting—character focus deals more with the specific attention on the character's traits, immersion might suggest a general deep engagement but lacks the precise terminology used in the craft, and acting range refers to the variety of characters and emotions an actor can portray. Concentration, however, captures the essence of being present and fully engaged within the character's reality, making it the most accurate term for the described ability.