A Working Glossary of Theatre Terms

Every profession has its own shorthand. Theatre is no exception. If you have ever been in a first rehearsal and heard the stage manager say "places" or a director ask you to "find your mark," you know that these words carry specific weight. And if you are newer to the craft, the vocabulary can feel like a second language you are expected to already speak.

This is not a textbook. It is a practical reference — the terms you will actually hear in rehearsal rooms, audition halls, and backstage corridors, defined the way working actors use them. If a word has a formal definition and a practical one, we have gone with the practical one.

Beat

A unit of action within a scene, defined by a shift in intention, tactic, or subject. When your character's objective changes — when you stop persuading and start threatening, for example — that is a new beat. Directors often ask actors to "find the beats" in a scene, meaning: identify where these shifts happen and make clear choices at each one. The term is also used in a timing sense ("take a beat") to mean a brief pause.

Blocking

The physical staging of a scene — where actors move, when they move, and where they end up. Blocking is typically set by the director during early rehearsals and recorded by the stage manager. Good blocking serves the story. It tells the audience where to look and what relationships matter. As an actor, writing your blocking in pencil is standard practice. It will change.

Callback

A second (or third) audition, usually with a smaller group of actors who are being seriously considered for a role. Callbacks often involve reading with other actors being considered for complementary roles, so the creative team can see how different combinations work together.

Call for Line

What an actor says during rehearsal when they have forgotten their next line and need the stage manager or prompt to supply it. The actor pauses, says "line," and the prompt reads the first few words to get them going again. It is a normal part of the rehearsal process and nothing to be embarrassed about — it means you are doing the work of getting off book. You can practice this process on your own with Call for Line's scene partner feature.

Cold Read

Reading a script or sides aloud with little or no preparation. Cold reads are common in auditions, especially for commercial and film work, where you may receive the material minutes before you walk into the room. The skill is not about perfection — it is about making strong, specific choices with limited time. For more on building this skill, see How to Prepare for a Cold Read.

Cross

A movement from one area of the stage to another. When the director says "cross downstage left on that line," they mean walk to the front-left area of the stage while delivering the line. Crosses are usually motivated — your character has a reason to move, even if the reason is as simple as needing physical distance from another character.

Cue

A signal for something to happen. An actor's cue is the line, sound, or action that tells them to speak or move. A lighting cue is a signal for the board operator to execute a change. Cues are numbered and tracked in the prompt book. "Picking up your cues" means reducing the dead air between one actor's last word and the next actor's first word.

Curtain Call

The moment after the performance when the cast takes their bows. Curtain calls are usually staged and rehearsed, with the order of bows reflecting the size of the roles. In professional theatre, the curtain call is considered part of the performance — the energy and timing matter.

Downstage

The area of the stage closest to the audience. The term comes from the era of raked stages, which literally sloped downward toward the audience. When a director asks you to "come downstage," they want you to move closer to the front. Downstage is a powerful position — it puts you nearest to the audience and often commands the most attention.

Dress Rehearsal

A full run-through of the production with all technical elements — costumes, lights, sound, set changes — executed as they will be in performance. Dress rehearsals are your opportunity to practice in the actual conditions of the show. If your costume restricts your movement or your quick change is tighter than you expected, this is where you find out.

Equity

Short for Actors' Equity Association, the labor union representing professional stage actors and stage managers in the United States. Equity negotiates contracts, sets minimum pay rates, and enforces working conditions. "An Equity production" means the show operates under an Equity contract and hires union members. Joining Equity is a significant career milestone, though it also limits which non-union work you can accept.

Fourth Wall

The imaginary barrier between the performers and the audience. In most realistic theatre, actors behave as if this wall exists — they do not acknowledge the audience directly. "Breaking the fourth wall" means addressing the audience, which some plays do intentionally and to great effect. If a play does not call for it, keep the wall intact.

Green Room

The backstage room where actors wait when they are not onstage. The origin of the name is debated and nobody has a definitive answer. What matters is the function: it is your holding area. Green rooms range from comfortable lounges to folding chairs in a hallway. Either way, keep it quiet when the show is running.

Mark

A piece of tape on the stage floor (or a spot on a film set) that indicates where an actor should stand. Hitting your mark means arriving at the right spot at the right moment. In theatre, marks are often set during blocking rehearsals. In film, they are essential for focus and framing. The note "you missed your mark" is one you want to hear only once.

Monologue

An extended speech by one character, delivered without interruption. Monologues come in many forms — a soliloquy addressed to the audience, a courtroom argument delivered to other characters, a story told to a scene partner. Preparing a monologue well means understanding who you are talking to, what you want from them, and why you need to say all of this right now.

Notes

Feedback given by the director to the cast after a rehearsal or performance. Notes sessions are part of the job. The expectation is that you write your notes down, apply them, and do not argue in the moment. Good directors give notes that are specific and actionable. Good actors take them with professionalism regardless.

Off Book

Having your lines memorized to the point where you no longer need the script in hand. Being off book does not mean perfect — it means you can work through the scene without reading. Most directors set an off-book deadline a few weeks into rehearsal, after which you are expected to have the words down. The real work of acting begins once the script is out of your hands. For more on what this means in practice, read What Does "Off Book" Mean?.

Places

The stage manager's call telling actors to go to their positions for the top of the show or the top of an act. When you hear "places," it means the performance is about to begin. Get to your starting position, settle in, and focus. There is no call after places. The next thing that happens is the show.

Prompt Book

The stage manager's master copy of the script, containing all blocking notations, cue placements, technical notes, and production information. The prompt book is the definitive record of the production. It is sometimes called "the book" and the stage manager is said to be "on book" or "calling the show" from it.

Read-Through (Table Read)

An early rehearsal where the cast sits together and reads the entire script aloud, usually around a table. The read-through is often the first time the full cast hears the play together. Directors use it to get a baseline sense of the piece and to begin conversations about the work. The instinct to perform at a read-through is natural, but most directors prefer you to stay open and exploratory rather than arriving with a locked-in performance.

Run-Through

A rehearsal where the cast performs the show (or a large portion of it) without stopping, as close to performance conditions as the current stage of rehearsal allows. Run-throughs let the company feel the shape and rhythm of the whole piece. Directors typically save their notes for after the run rather than interrupting.

Scene Partner

The other actor or actors in your scene. Your scene partner is your most important resource in performance — what you give them and what you receive from them is where the life of the scene lives. Listening to your scene partner is more important than remembering your lines, though ideally you can do both. When rehearsing on your own, having someone or something to read the other part makes a real difference. Call for Line reads your scene partner's lines aloud so you can rehearse the give-and-take even when you are alone.

Sides

A portion of the script, usually just the scenes relevant to your character. Sides are what you receive for auditions — not the full script, just the pages you will be reading. The term also applies to the excerpts used in rehearsal when you are working a specific scene rather than running the full show.

Soliloquy

A speech in which a character speaks their thoughts aloud, typically alone onstage. Soliloquies are addressed to the audience or to the character themselves, not to another character in the world of the play. Hamlet's "To be or not to be" is the most famous example. The key question for the actor is always: who are you talking to, and what are you working through?

Stage Directions (Stage Left / Stage Right)

Directions as oriented from the actor's perspective when facing the audience. Stage left is the actor's left. Stage right is the actor's right. This is the opposite of the audience's perspective, which is why clarity matters. Stage directions also refer to the written instructions in a published script (entrances, exits, physical actions), though many directors treat these as suggestions rather than mandates.

Strike

The process of disassembling the set, removing all technical elements, and returning the theatre to its empty state after the final performance. Strike usually happens immediately after the last show, and the full company is generally expected to participate. It is physical work, and there is something both practical and symbolic about taking it all apart together.

Swing

A member of the ensemble who understudies multiple roles, ready to step into any of several tracks on short notice. Swings are among the most skilled and adaptable performers in a company. They must know the blocking, harmonies, and choreography for every role they cover. The job requires remarkable preparation and the ability to perform with minimal rehearsal in a given track.

Tech Rehearsal

The rehearsal process (usually spanning several days) where all technical elements — lighting, sound, set changes, projections, special effects — are integrated into the production for the first time. Tech is slow, methodical, and sometimes tedious for actors, as the focus is on timing cues and solving technical problems rather than acting. Patience during tech is a professional skill.

Understudy

An actor who learns a principal role and is prepared to perform it if the primary actor is unable to go on. Understudies rehearse the role, attend performances, and must be ready at any time. The job requires discipline and a particular kind of mental readiness — you are always prepared to perform but may not get the chance on any given night.

Upstage

The area of the stage farthest from the audience. The term is also used as a verb: to "upstage" someone means to draw focus away from them, often by positioning yourself behind them so they have to turn away from the audience to interact with you. Doing this intentionally is considered poor form. Doing it accidentally is a blocking problem your director will fix.

Wings

The areas just offstage, to the left and right, hidden from the audience's view by curtains or flats. The wings are where actors wait for their entrances, where crew members stand by for set changes, and where props are staged for use. Keep the wings quiet and clear. Other people are working there, and the audience is closer than you think.