# apex

/ˈeɪˌpɛks/ (US) · /ˈeɪpɛks/ (UK)

Source: https://englishreference.com/word/apex
Updated: 2026-06-20

## Senses

### 1. highest physical point

noun · CEFR C1 · Formal

the top or highest part of something, especially when it forms a point.

For teachers: the vertex or highest point of a physical structure, such as a mountain, building, or geometric shape.

- The climbers finally reached the apex of the mountain just before noon.
- The architect designed the roof so that its apex would align perfectly with the position of the North Star during the winter solstice.

Usage: Often used with 'of' to describe the top of a specific structure.

### 2. highest level of success

noun · CEFR C1 · Formal

the most successful or powerful part of a career, life, or story.

For teachers: the figurative peak or climax of a career, historical period, or developmental process.

- Winning the world championship was the apex of her sporting career.
- Historians often debate whether the empire reached its apex during the third century or if its decline had already begun by then.

### 3. top of a hierarchy

noun · CEFR C1 · Technical · Academic

the highest level of a system, such as the top of the food chain.

For teachers: the highest position in a hierarchical system or ecological structure.

- As an apex predator, the lion has no natural enemies in the wild.
- The study examines how the removal of an apex predator can cause a collapse in the lower levels of the local ecosystem.

Usage: Frequently used as a modifier in the phrase 'apex predator'.

### 4. racing line

noun · CEFR C2 · Technical

the point in a corner where a racing car is closest to the inside edge.

For teachers: the point in a curve or corner where a vehicle is closest to the inside edge of the track, allowing for maximum speed.

- The driver missed the apex of the turn and lost several seconds.
- Mastering the ability to hit the apex consistently is what separates professional racing drivers from amateurs on this technical circuit.

## Examples

- The climber finally reached the apex of the mountain.
- Winning the championship was the apex of her professional career after years of hard work.
- In many ecosystems, the apex predator plays a vital role in maintaining the balance of species by preventing any single population from becoming too dominant.

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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.