plural of first order stream

World War I.

plural of first aid kit

A collection of first aid supplies for treatment of minor injuries or stabilization of major injuries.

(law, informal) the concept that a dog is not considered dangerous until it has bitten someone.

(idiomatic) A person or position that is formally of equal rank to others in a group, but nonetheless takes a leading role within that group.

(logic) A formal deductive system extended from propositional logic with the possibility to quantify over individuals of the domain of discourse.

(nautical) The first port that a vessel calls in at after the start of a voyage / (idiomatic) The first place to go to start a process.

To initiate something.

(chiefly in the negative) To have any knowledge (about something); have a clue. / Used other than figuratively or idiomatically: see have, first, idea.