# heuristic

/hjʊˈɹɪstɪk/ (US)

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

## Senses

### 1. a mental shortcut

noun · CEFR C1 · Academic

a simple rule or mental shortcut that helps you make a decision quickly when you do not have all the facts.

For teachers: a cognitive shortcut or 'rule of thumb' used to simplify complex decision-making processes.

- Using the price of a product as a heuristic for its quality is common but not always accurate.
- The availability heuristic often leads people to overestimate the probability of rare events simply because they are more memorable.

Usage: Often used in psychology and behavioral economics to describe human bias.

### 2. a practical algorithm

noun · CEFR C1 · Technical

a way for a computer to find a solution to a hard problem quickly by using a 'best guess' instead of checking every option.

For teachers: a technique designed for solving a problem more quickly when classic methods are too slow, or for finding an approximate solution when classic methods fail.

- The software uses a heuristic to find the fastest route through the city traffic.
- Engineers implemented a greedy heuristic to provide a near-optimal solution for the traveling salesman problem within a reasonable timeframe.

Usage: Commonly used in computer science and operations research.

### 3. practical and non-optimal

adjective · CEFR C1 · Academic

describes a method that is based on experience and practice rather than a perfect theory.

For teachers: relating to or using a problem-solving technique that is practical and sufficient, though not theoretically perfect.

- The team took a heuristic approach to the project because they had very little time.
- Heuristic methods are indispensable in fields where data is incomplete and the cost of an exhaustive search is prohibitive.

Usage: Usually precedes the noun it modifies, such as 'heuristic method' or 'heuristic analysis'.

## Examples

- Using a simple heuristic helps me prioritize my daily tasks.
- The software uses a specific heuristic to identify potential security threats without scanning every single line of code.
- In cognitive psychology, the availability heuristic describes the mental shortcut where people judge the probability of an event based on how easily examples come to mind.

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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.