Theatre Glossary
Whether you're stepping on stage for the first time or picking up a script to read, here's a guide to the terms you'll encounter in the world of theatre.
299 terms
Bass
The lowest male vocal range, characterised by depth, resonance, and authority. In opera and musical theatre, bass voices often portray kings, villains, elder characters, and figures of power or wisdom. While fewer leading roles are written specifically for basses than for tenors or baritones, the bass voice adds gravity and richness to ensemble singing and is unmistakable in its dramatic impact.
Musical TheatreBatten
A long metal pipe suspended above the stage from which scenery, curtains, and lighting instruments are hung. Battens are part of the fly system and can be raised or lowered using ropes and counterweights. They are numbered from the front of the stage (nearest the audience) to the back, giving the crew a standard reference for positioning elements.
Stagecraft & TechnicalBeat
The smallest unit of action in a scene—a single exchange, shift in intention, or moment of change. Beats are defined by shifts in a character's objective or tactic: when one approach stops working and a new one begins, that's a new beat. Actors and directors "beat out" scenes during rehearsal to understand their internal structure. The term is also used loosely to mean a brief pause in dialogue ("take a beat").
Acting & PerformanceBelt
A powerful, chest-voice-dominant singing technique used extensively in musical theatre to deliver high notes with intensity, volume, and emotional impact. Belting creates a raw, exciting sound distinct from the lighter, head-voice approach of classical singing. Performers like Ethel Merman, Patti LuPone, and Idina Menzel are celebrated belters. The technique requires careful training to avoid vocal strain.
Musical TheatreBilling
The order and prominence in which performers' and creative team members' names appear in promotional materials, programmes, and marquees. Billing reflects status, contractual agreements, and industry conventions. "Top billing" means appearing first and most prominently. In commercial theatre, billing negotiations can be as detailed and contentious as salary discussions.
Industry & BusinessBit Part
A very small speaking role in a play, typically consisting of only a few lines. Despite their brevity, bit parts can be memorable when performed with specificity and commitment. For emerging actors, bit parts in professional productions provide valuable experience and credits. The theatrical adage "there are no small parts, only small actors" speaks to the importance of fully committing regardless of role size.
Acting & PerformanceBlack Box Theatre
A simple, flexible performance space—typically a rectangular room painted black—that can be configured in various seating arrangements (thrust, in-the-round, traverse, proscenium, or any combination). Black box theatres are prized for their versatility and intimacy, making them ideal for experimental work, new writing, and productions that benefit from close proximity between audience and performer.
Venues & SpacesBlackout
The complete extinguishing of all stage lights, plunging the performance space into darkness. Blackouts are used to signal the end of a scene or act, create dramatic effect, or allow for set changes. A "blackout sketch" is a short comedic scene that ends with a sudden blackout on the punchline.
Stagecraft & TechnicalBlacks
The standard all-black clothing worn by stage management and backstage crew during performances to remain invisible in the wings and during scene changes. Also refers to the black drapes (curtains and masking) used to define the stage space and hide backstage areas. Wearing blacks is one of the first things new crew members learn—no white, no bright colours, no reflective materials that might catch the light and distract the audience.
Stagecraft & TechnicalBlocking
The planned movement and positioning of actors on stage during a production. Directors work out blocking during rehearsals, determining where actors stand, sit, move, and interact within the set. Good blocking supports the storytelling, ensures sightlines for the audience, and creates visually compelling stage pictures. Actors typically note their blocking in pencil in their scripts.
Directing & ProductionBlocking Notation
The system of abbreviations and symbols used to record actors' movements in a script or prompt book. Standard abbreviations include X (cross), DL (downstage left), UC (upstage centre), and so on. Stage managers develop personalised shorthand to capture complex movement quickly during blocking rehearsals. Clear blocking notation ensures the show can be faithfully restaged.
Acting & PerformanceBlocking Rehearsal
An early-stage rehearsal focused specifically on establishing the physical movement patterns of the actors on stage. The director guides actors through their entrances, exits, crosses, and positions for each scene, while the stage manager records everything in the prompt book. Blocking rehearsals prioritise spatial arrangement over emotional depth—the "where" before the "how."
Directing & ProductionBook
In musical theatre, the "book" refers to the spoken dialogue and storyline of a musical, as distinct from the score (music) and lyrics. A "book musical" tells its story primarily through dialogue with songs integrated into the narrative, as opposed to a "revue" or "jukebox musical." The book writer (or librettist) is responsible for the script.
Musical TheatreBorders
Short horizontal curtains hung above the stage to mask the overhead technical equipment—lights, battens, and the fly system—from the audience's view. Borders work in combination with legs to frame the visible stage area. They're typically made from black fabric and are spaced at intervals from the front to the back of the stage.
Stagecraft & TechnicalBox Seats
Small, semi-private seating areas located on the sides of the auditorium, close to the stage and typically elevated above orchestra level. Boxes are a holdover from historical theatre design when they were reserved for royalty, aristocrats, and wealthy patrons. While they offer proximity and prestige, box seats often provide a limited or angled view of the stage.
Venues & SpacesBox Set
A realistic stage setting consisting of three walls and sometimes a ceiling, creating the illusion of an interior room with the fourth wall removed so the audience can see in. Popularised during the rise of theatrical realism in the late 19th century, box sets helped establish the convention of the invisible fourth wall between performers and audience.
DesignBreak a Leg
A traditional theatrical expression meaning "good luck," used because saying "good luck" directly is considered bad luck in theatre superstition. The exact origin is debated—theories include references to bowing (breaking the line of the leg), the hope of performing so well that one breaks through the "leg" curtains for a curtain call, or simply the theatrical tradition of inverting wishes.
Industry & BusinessBroadway
The highest level of commercial theatre in the United States, referring to the 41 professional theatres (with 500+ seats) located in the Theatre District of Midtown Manhattan, New York City. A "Broadway show" implies major professional production values, union actors, and significant financial investment. The Tony Awards recognize excellence in Broadway theatre annually.
Venues & SpacesCabaret
A form of entertainment featuring music, song, dance, comedy, or drama performed in an intimate venue, typically a restaurant or nightclub with a stage. Cabaret emerged in 1880s Paris and has evolved to include theatrical cabaret shows. The format emphasizes a close relationship between performer and audience, often with direct address and audience interaction.
Genres & StylesCallback
A second (or subsequent) audition to which selected actors are invited after an initial round. Callbacks allow directors to see actors read specific scenes, interact with potential cast partners, or demonstrate particular skills. Being called back is generally a positive sign, though it doesn't guarantee being cast.
Acting & PerformanceCall Board
A backstage bulletin board where important production information is posted, including rehearsal schedules, costume fitting times, notes from the director or stage manager, and sign-in sheets. Cast and crew are expected to check the call board regularly. In many modern companies, digital call boards via apps or group messages have supplemented or replaced the physical board.
Directing & ProductionCall Time
The specific time at which actors and crew are expected to arrive at the theatre for a rehearsal or performance. Call times are set by the stage manager and may vary by department—actors might have a later call than the technical crew. A "half-hour call" is the standard warning given 30 minutes before curtain, followed by calls at 15 minutes, 5 minutes, and "places."
Directing & ProductionCast
Both a noun and a verb in theatre. As a noun, the cast is the group of actors performing in a production. As a verb, to cast means to select actors for roles. "Casting" is the overall process, and a "cast list" is the official announcement of who has been assigned which roles. An "ensemble cast" suggests no single lead, with roles of roughly equal importance.
Acting & PerformanceCast Party
A social gathering held after the final performance of a production (closing night) to celebrate the shared experience of the show. Cast parties bring together actors, crew, designers, and sometimes friends and family. They're a cherished theatre tradition that acknowledges the temporary, communal nature of every production—a chance to mark the end of something that can never be repeated.
Industry & Business