`one` in Latin

one

1. numeral
   • the number 1
     
     ūnus

     I have one apple. — Ūnam mālum habeō.
2. pronoun
   • [formal], an unspecified person
     
     quis [formal]

     One should always be honest. — Quis semper honestus esse dēbet.

     aliquis [formal]

     One must try their best. — Aliquis summā ope nītī dēbet.
3. noun
   • a single person or thing
     
     ūnus

     She is the one I love. — Ea est ūna quam amō.

     singulāris

     He is the one who survived. — Ille est singulāris quī superāvit.
4. adjective
   • being a single unit
     
     ūnus

     They spoke with one voice. — Ūnā vōce locūtī sunt.