# projector

/pɹəˈdʒɛktɝ/ (US) · /pɹədʒˈɛktɐ/ (UK)

Source: https://englishreference.com/word/projector
Updated: 2026-08-08

## Senses

### 1. optical device

noun · CEFR A2

a machine that shines light to show pictures or films on a big screen or a wall.

For teachers: an optical device that projects a beam of light to display still or moving images onto a surface.

- The teacher turned on the projector to show the students a map of the world.
- The conference room was equipped with a high-definition projector that allowed the presenters to display complex data charts with perfect clarity.

### 2. planner or proposer

noun · CEFR C1 · Formal

a person who plans or suggests a new project or business idea.

For teachers: a person who devises, promotes, or manages a project or scheme.

- He was the main projector of the new city park plan.
- Historical accounts describe him as a tireless projector of industrial schemes, many of which were decades ahead of their time.

### 3. psychology

noun · CEFR C2 · Technical

someone who thinks other people have the same feelings that they are actually feeling themselves.

For teachers: an individual who ascribes their own unconscious feelings, impulses, or thoughts to others.

- As a chronic projector, he accused his colleagues of being angry when he was the one who was upset.
- The therapist noted that the patient was a frequent projector, often attributing his own insecurities to his partner during their sessions.

### 4. mathematics

noun · CEFR C2 · Technical

a mathematical tool or rule that creates a projection.

For teachers: an operator or function that maps an element to its projection in a subspace.

- The professor explained how to use a projector to simplify the vector equation.
- In linear algebra, a projector is an idempotent linear transformation that maps the entire vector space onto a specific subspace.

## Examples

- The teacher turned on the projector to show the slides.
- We had to dim the lights in the conference room so the projector image would be clear.
- Modern digital projectors offer high-resolution output and wireless connectivity, allowing presenters to share content directly from their mobile devices without needing complex cable setups.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.