Deletion in an array involves removing an element from a specific position in the array. Here's an example implementation of deleting an element from an array in C:

```
#include <stdio.h>

void delete_element(int arr[], int n, int pos) {
    // Shift elements to fill deleted element's position

    for (int i = pos; i < n-1; i++) {
        arr[i] = arr[i+1];
    }
}

int main() {
    int arr[10] = {1, 3, 5, 7, 9};
    int n = 5; // number of elements in array
    int pos = 2; // position to delete element
    delete_element(arr, n, pos);
    n--; // decrement number of elements in array
    // Print array after deletion
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    return 0;
}
```

In this implementation, the `delete_element()` function takes an array, its length, and the position to delete as input. The function shifts all elements after the delete position to the left to fill the gap left by the deleted element. The `main()` function initializes an array and then deletes an element from it at position 2. Finally, it prints the array after deletion.

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