(law, archaic) The party to a legal dispute who first raised a complaint in a court. / (law, archaic) The first party named in a contract, generally the party agreeing to perform a duty thereunder.

World War I.

plural of first order stream

plural of first aid kit

A collection of first aid supplies for treatment of minor injuries or stabilization of major injuries.

(physics) The observation that objects in motion tend to stay in motion, and objects at rest tend to stay at rest unless an outside force acts upon them.

(law, informal) the concept that a dog is not considered dangerous until it has bitten someone.

A person purchasing a house for the first time, as opposed to one who already owns a house and is selling it in order to buy another. / A person who purchases something for the first time.

(differential geometry) the Riemannian metric for 2-dimensional manifolds, i.e. given a surface with regular parametrization x(u,v), the first fundamental form is a set of three functions, {E, F, G}, dependent on u and v, which give information about local intrinsic curvature of the surface. These functions are given by

plural of party of the first part