Definition: Deletion (or deletions) refers to the act of removing a certain piece or element from the data structure being operated on, such as a list, dictionary, or set in programming languages like Python. Deletion can be thought of as either deleting an item at a specified index, or deleting all instances of a given value. In programming, deletion is often used to delete elements in a list to remove them from that list and allow the next time that list is accessed (e.g., through the `list[0]` method) it will be empty. In other contexts (such as dictionaries), deletion can occur when the key or value associated with it is deleted, which may result in a dictionary becoming empty. Deletion can also refer to removing elements from a set or any data structure that represents a collection of items without adding new ones, such as a list, list comprehension, or tuple. Deletions allow for quick access and modification of the underlying data within the collection. The concept of deleting is fundamental in programming, often used to iterate over or manipulate collections where the elements are identified by their keys, not their values.

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