# Einstein

/ˈaɪnstaɪn/ (US)

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

## Senses

### 1. Albert Einstein

noun · CEFR B1

Albert Einstein, the famous scientist who discovered the theory of relativity.

For teachers: Albert Einstein (1879–1955), the German-born theoretical physicist widely ranked as one of the greatest scientists of all time.

- We are studying Einstein and his theories in my physics class this week.
- Einstein revolutionized our understanding of space and time with the publication of his general theory of relativity in 1915.

### 2. a very smart person

noun · CEFR B2 · Informal

a person who is extremely intelligent.

For teachers: A common noun used to describe an individual possessing exceptional intellectual ability or genius.

- You don't need to be an Einstein to figure out how to open the box.
- The new software engineer is a total Einstein; she solved the architectural bottleneck in less than an afternoon.

### 3. sarcastic comment for a mistake

noun · CEFR B2 · Informal · Humorous

a name you call someone sarcastically when they say or do something obvious or silly.

For teachers: An ironic appellation used to mock someone who has just made a blunder or stated the obvious.

- Nice job locking your keys in the car, Einstein.
- After he spent twenty minutes looking for the glasses that were on his head, his sister just sighed and said, 'Way to go, Einstein.'

### 4. a unit of light

noun · CEFR C2 · Technical

a technical unit used to measure a specific amount of light particles.

For teachers: A unit of measure equal to one mole of photons, typically used in the study of photosynthesis and irradiance.

- The scientist measured the light in einsteins to see how the plants grew.
- The quantum yield of the reaction was calculated by determining the number of moles of product formed per einstein of light absorbed.

### 5. a geometric shape

noun · CEFR C2 · Technical

a special shape that can cover a flat surface in a pattern that never repeats.

For teachers: A single tile shape (an aperiodic monotile) that can cover a plane without ever creating a repeating pattern.

- Mathematicians recently discovered a new 'einstein' shape that tiles a surface without repeating.
- The discovery of the 'hat' polykite provided the first true example of an einstein, solving a long-standing problem in plane geometry.

## Examples

- You don't need to be an Einstein to solve this puzzle.
- Nice job locking your keys in the car, Einstein.
- While the team lacked a singular Einstein to lead the research, their collective expertise allowed them to solve the complex physics equations ahead of schedule.

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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.