Closure can have different meanings depending on the context. Here are some definitions based on the search results:

• In programming: A closure is a combination of a function and references to its surrounding state (the lexical environment). It gives access to an outer functions scope from an inner function. Closures are created every time a function is created, at function creation time. They are useful because they let you associate data (the lexical environment) with a function that operates on that data.

• In relationships: Closure refers to having a sense of understanding, peace, and accepted finality of the relationship whether its ended because of loss, breakup, or other reasons. It is a process of coming to terms with the end of a relationship and finding emotional resolution.

• In general: Closure is the end or the closing down of something. It can be physical, like the closure of a business or a road, or emotional, like the closure you experience when you finally come to terms with the end of a romance. It can also refer to an obstruction in a small passage, like a pipe, or the button on your sweater. In debate, closure (usually cloture) stops debate and starts the vote.

In summary, closure can refer to the end or closing down of something, finding emotional resolution after the end of a relationship, or a programming concept that allows a function to access its surrounding state.