null
n. countablen. nothing, or a value that means there is no data. In computing, it shows that a space is empty or a link leads nowhere.
n. a value representing the absence of data or a zero-magnitude result. In programming, it signifies a pointer that does not refer to any object or address.
The database returned a null value for the missing phone number.
If the user leaves the middle name field empty, the system records it as null in the profile.
The experiment was deemed a failure when the results showed a null effect, suggesting that the new drug was no more effective than the existing placebo.
Borrowed from Middle French nul, from Latin nūllus.
Often used as a technical term in mathematics and computer science; frequently functions as an attributive modifier in phrases like 'null set' or 'null hypothesis'.