# billiard

/ˈbɪɫjɝd/ (US) · /bˈɪlɪəd/ (UK)

Source: https://englishreference.com/word/billiard
Updated: 2026-08-27

## Senses

### 1. relating to the game

adjective · CEFR B2

used to describe things that belong to the game of billiards.

For teachers: pertaining to the game of billiards; typically used as an attributive noun.

- The old hotel had a beautiful billiard room with dark wood walls.
- The restoration of the billiard table required specialized felt and a level of precision that few local craftsmen could provide.

Usage: Usually appears before another noun, such as 'table', 'room', or 'ball'.

### 2. a specific shot

noun · CEFR C1 · Technical

a shot in games like billiards where your ball hits two other balls.

For teachers: a shot in which the cue ball strikes two other balls in succession; a carom.

- He won the game with a perfect billiard into the corner.
- The player executed a difficult billiard, using the side cushion to redirect the cue ball toward the final target.

### 3. math/physics system

noun · CEFR C2 · Technical · Academic

a math model where a particle bounces off boundaries like a ball on a table.

For teachers: a dynamical system in which a particle alternates between straight-line motion and specular reflections from a boundary.

- The professor explained how a billiard works in a circular space.
- In chaotic dynamics, the Sinai billiard serves as a fundamental model for studying the behavior of particles in a confined geometry.

### 4. a very large number

numeral · CEFR C2 · Archaic · British English

a very old name for the number one followed by 15 zeros.

For teachers: a thousand billion (10 to the power of 15) in the long scale system.

- In some old books, a billiard meant a thousand billion.
- The term billiard is now largely obsolete in British mathematics, having been replaced by the short-scale quadrillion.

Teaching tip: This sense is extremely rare and likely to confuse modern speakers; avoid using it in contemporary contexts.

## Examples

- The billiard table is in the corner of the room.
- The hotel offers a private billiard room for guests who want to play during their stay.
- The restoration of the antique billiard table required specialized craftsmanship to preserve the original wood grain and the intricate carvings on the cushions.

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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.