(cinematography) The team that shoots footage which is of primary importance for the final cut of the motion picture, including all scenes involving actors, or at least stars of the motion picture.

(US, education) The first year of grade school, the period in school that comes after kindergarten and before second grade. Children usually begin first grade at age six.

describing the members of a sports team who play regularly at the start of a match (rather than being substituted on)

(astronomy) The waxing lunar phase, from new moon to half way between new moon and full moon.

The highest quality of gemstones, especially of diamonds and pearls. / (by extension) The highest rank or quality or the greatest degree.

(sequence, idiomatic) to begin with; earlier; firstly; originally; at the start, / (idiomatic) at all, even (typically in non-negated statements)

First choice, preference.

the members of a sports team who play regularly at the start of a match (rather than being substituted on) / the first violinist in an orchestra.

(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.

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.