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

(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.

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.

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.

(medicine) Basic medical care given to an injury victim, usually where the injury is slight or where better care is not available.

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

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

(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.

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

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