BEFORE › before everything or everyone else: I can go to the cinema, but I've got to do my homework first. Jason came first in the 400 metres (= he won).
FIRST TIME › for the first time: I first heard the song on the radio. He first started playing the piano at school.
at first › at the beginning of a situation or period of time: At first I thought she was unfriendly, but actually she is just shy.
first; first of all › used to introduce the first idea, reason, etc in a series: First, I think we have to change our marketing strategy. › before doing anything else: First of all check you have all the correct ingredients.
come first › to be the most important person or thing: Her career always comes first.
put sb/sth first › to consider someone or something to be the most important thing: Most couples put their children first when sorting out their problems.
First come, first served. › something you say when there is not enough of something for everyone and only the first people who ask for it will get it