(US, military, informal) A first-class cadet. / (informal, by extension) Someone who does something for the first time; a debutant / (informal) Someone who is in the first year, or round, of something

(obsolete) Earlier, former.

(in combination) A person who advocates the primacy of the named entity (who puts it first).

Alternative spelling of first light

(nonstandard) very first.

(archaic) Of fruit, the earliest to ripen; the freshest.

plural of firstie

The state or condition of being first; priority.

(US politics) A supporter of any one of the "America First" isolationist movements or parties.

(nonstandard, non-native speakers' English) First of all; firstly