adjetivo “first”
 forma base first, não graduável
- primeiroInscreva-se para ver as traduções de frases de exemplo e as definições monolíngues de cada palavra. 
 My first attempt at baking a cake was a complete disaster. 
- principalIn her field, she is regarded as the first authority on genetic research. 
- nobre (associado à família mais alta em um país)The first lady of the country is the wife of the president. 
advérbio “first”
- primeiramenteFirst, let's go over the safety procedures before we start the experiment. 
- inicialmenteShe first met her future husband at a friend's wedding. 
substantivo “first”
 sing. first, pl. firsts ou incontável
- o primeiroShe was the first in the race. 
- primeira marchaAfter starting the car, make sure it's in first before you pull away from the curb. 
- estreia (um evento ou instância que acontece pela primeira vez)His invention was a first in the field of renewable energy technology.