Null often pops up in legal and scientific contexts; it was originally used in Scottish law and still carries the meaning "having no legal or binding force," especially in the phrase "null and void."

null (nʌl) adj 1. without legal force; invalid; (esp in the phrase null and void) 2. without value or consequence; useless

What is the etymology of the noun null? null is a borrowing from Latin. Etymons: Latin nūllus.

NULL definition: 1. having no legal force: 2. with no value or effect: 3. (of a set or matrix) containing nothing…. Learn more.

In the SQL database query language, null or NULL is a special marker used to indicate that a data value does not exist in the database.

Jul 11, 2025 · In computer science, a null value represents a reference that points, generally intentionally, to a nonexistent or invalid object or address. The meaning of a null reference varies …

Null definition: Having no legal force; invalid.

Sep 7, 2025 · The concept of null and its significance in computing with our comprehensive definition, examples, and explanations. Learn how null differs from zero and empty.

A NULL value represents an unknown, missing, or inapplicable data in a database field. It is not a value itself, but a placeholder to indicate the absence of data.

NULL definition: without value, effect, consequence, or significance. See examples of null used in a sentence.