(colloquial, usually childish) Alternative spelling of nighty night

(grammar) The plural form of a common noun / (grammar) A noun that inherently refers to multiple items

plural of national treasure

A person, place, or object that is deemed to be of value to an entire nation, usually due to its cultural significance.

(informal) Designating a time when something will become available, supposedly (but perhaps only optimistically) in the near future.

A body snatcher; a grave robber.

A freshwater bird, Podiceps nigricollis, of the grebe family (Podicipedidae)

(computing) Not generating a line break, as in non-breaking space or non-breaking hyphen.

An octane number, used by the American Society for Testing and Materials to estimate the antiknock characteristics of a fuel at low engine speeds

(physics) The quantum number that represents the angular momentum of an atomic orbital