Of or relating to someone (a first party) directly involved in a given transaction, such as a buyer or seller. / Of or relating to the plaintiff in a lawsuit.

Alternative spelling of firsthand / Used other than figuratively or idiomatically: see first hand.

A phrase encouraging perceived polite gentlemanliness, allowing the ladies to go before the men

The first part of a harvest; sometimes made into an offering / The first profits from an undertaking

A country's most important city, usually the capital.

(idiomatic) second place.

(mathematics, logic) Of one of a series of models, languages, relationship, forms of logical discourse, etc., being the simplest one or the first in a sequence. / Of fundamental importance.

The leading woman in a specified field of endeavor. / Alternative spelling of First Lady

The wife of the chief executive of a nation; especially the wife of the President of a country; or a woman (e.g. a relative) who takes on similar public duties, as when the chief executive is unmarried.

A member of an emergency service who is first on the scene, or among those first on the scene, at an emergency. / A member of an emergency service trained to provide emergency medical care.