The official name of Liechtenstein.

(mathematics) An ultrafilter such that every set belonging to it is the superset of some fixed singleton set.

The official name of Monaco.

plural of principal investigator

(sciences) lead researcher on a grant-funded project

The official name of Wales prior to England's union with Wales in 1542. / In general use, the full name of Wales.

plural of principal ultrafilter

plural of principal ideal

plural of security principal

(grammar, usually in the plural) Any of the forms of a word which contain its stem(s) in the simplest form, or such a form that, when taken with all the other principal parts, allows the entire paradigm to be derived.