Ampère's circuital law

(calculus) A formula for computing the derivative of the functional composition of two or more functions.

(printing, historical) A fine, thin, short metal rule of the same height as the type, used in printing short lines in tabular matter.

A fundamental rule, upon which other matters hinge.

The rule that social parasites generally tend to be parasites of species or genera to which they are closely related.

plural of ruling class

(sociology) The social class of a given society that controls that society's political agenda, whether as formal aristocracy or party leadership or as an informal unit within democracies.

(phonetics) The rule describing a special case of tone reduction in Bantu languages, where in some contexts the second of two adjacent high tones is lowered.

plural of ruling pen

plural of rule joint