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% Glossary
Not every Rustacean has a background in systems programming, nor in computer
science, so we've added explanations of terms that might be unfamiliar.
### Arity
Arity refers to the number of arguments a function or operation takes.
```rust
let x = (2, 3);
let y = (4, 6);
let z = (8, 2, 6);
```
In the example above `x` and `y` have arity 2. `z` has arity 3.
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