知人（ちじん、chijin）
- acquaintance

The Japanese word 知人, read ちじん (chijin), generally translates to "acquaintance," "friend," or "someone you know." It refers to a person you have a relationship with, but not necessarily a close, intimate one. The level of closeness implied by 知人 is typically less than that of a friend (友達, ともだち, tomodachi), but more than a complete stranger. It suggests some level of familiarity or connection. The degree of the relationship is vague, and its meaning can slightly vary depending on the context. 知人 can also refer to people you know through work, school, or other social circles.

⚫︎ あの人は私の知人 Translation: That person is an acquaintance of mine. ⚫︎ 知人に会ったので、挨拶をした Translation: I met an acquaintance, so I greeted them. ⚫︎ 彼は知人にパーティーに誘われた Translation: He was invited to a party by an acquaintance.

⚫︎ Use 知人 when referring to people you are familiar with, but aren't necessarily close to. ⚫︎ It is appropriate for both formal and informal situations, though the specific tone can change depending on how polite you are in your speech. ⚫︎ Often used in introductions or when mentioning someone you know, without specifying the nature of the relationship. ⚫︎ 知人 is a versatile word, and can be used in various contexts.

⚫︎ 知人 is typically written in kanji 知人, with the reading in hiragana as ちじん. ⚫︎ There are no common variations in how it’s written.

⚫︎ 知り合い (しりあい, shiriai): This is a very common synonym, meaning "acquaintance" or "someone you know." It's generally a more casual term. ⚫︎ 友人 (ゆうじん, yuujin): Means "friend." Implies a closer relationship than 知人. ⚫︎ 仲間 (なかま, nakama): Means "colleague," "companion," or "group member" and can sometimes overlap in meaning depending on the context.

⚫︎ 他人 (たにん, tanin): This means "stranger," "other people," or "someone unrelated." It is the direct opposite of someone you know. ⚫︎ 知らない人 (しらないひと, shiranai hito): "A person you don't know," a more descriptive way to say "stranger."

私は彼の知人の一人です。 ・Translation: I am one of his acquaintances. ・Explanation: This sentence clarifies that the speaker is not a close friend, but rather someone who is part of the person's social circle.

会社の知人から電話がかかってきた。 ・Translation: I received a call from an acquaintance at work. ・Explanation: This sentence specifies that the acquaintance is connected to the speaker through their workplace.

The word 知人 is derived from the kanji 知 (ち, chi), meaning "to know," and 人 (じん, jin), meaning "person." Therefore, the literal meaning is "a person who is known." This etymology directly reflects the meaning of the word.