(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.

First choice, preference.

plural of first order stream

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

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.

(Scotland) The practice, during Hogmanay, of visiting friends and family, especially to be the first person to cross a home's threshold after midnight on New Year's Eve bearing a small gift.

The first produce or result, notably firstborn offspring. / The first of a class or kind. / The thing first thought or done.

Firstborn.

World War I.

The premier of several musicians playing a particular instrument in an orchestra: seated closest to the audience, taking the lead for that instrument's movements, and playing any solos.