Definitions

1. pronoun

a person or thing already mentioned or easily identified

“The author who wrote the novel is the one who spoke at the conference, and she is the one qui.”

2. adverb

in this place, here

“Je m’appelle Pierre, qui travaille ici.”

3. interrogative

used to ask a question about the identity of someone or something

“Qui est l’invité d’honneur?”

4. adjective

relating to or characteristic of the person or thing previously mentioned

“La pièce qui a remporté le prix est magnifique.”