The inside or interior of something; within.
箱の内に古い手紙が入っていた。
There were old letters inside the box.
会議室の内は外より暖かい。
The inside of the meeting room is warmer than outside.
建物の内へは許可がないと入れない。
You can't enter the building's interior without permission.
During or while (a certain time or period); within (a given timeframe). Often used to say 'while X' or 'within X' (e.g. while one is young).
若いうちに色々な国へ行ったほうがいい。
You should travel to various countries while you're young.
一週間の内に返事をください。
Please reply within a week.
子どものうちにピアノを習わせたい。
I want to have my child learn piano while they're young.
Among; out of (a group). Used to indicate a subset within a larger set (as in 〜のうち).
クラスのうち、五人が欠席した。
Out of the class, five people were absent.
候補者のうち最も経験があるのは田中さんだ。
Among the candidates, Mr. Tanaka has the most experience.
その提案のうち重要な点をまとめた。
I summarized the important points among those proposals.
Amidst a state (e.g., chaos, secrecy); indicates something occurring during that condition (as in 〜のうちに).
混乱のうちに手続きを進めたため、書類に不備があった。
Because we proceeded amid the confusion, there were mistakes in the documents.
その事件は秘密のうちに処理された。
That matter was handled in secret.
Within oneself; one's inner feelings or thoughts.
彼女の内は誰にも見せないようにしているようだ。
She seems to keep her inner feelings hidden from everyone.
嬉しい内もあれば、不安な内もある。
There are times when I'm happy and times when I'm anxious inside.
胸の内を打ち明けるのは勇気がいる。
It takes courage to confess what's in your heart.
We; our side; refers to one's own company or organization.
うちの会社ではリモートワークが一般的になった。
Remote work has become common at our company.
その件はうちで対応しますので、ご安心ください。
We'll handle that matter on our side, so please rest assured.
うちのチームは今期売上が伸びた。
Our team increased sales this term.
One's home or family; one's household.
うちに遊びに来ませんか？
Would you like to come over to my house?
年末はうちで親戚と過ごした。
I spent the end of the year at home with relatives.
うちの家族はみんな甘い物が好きだ。
Everyone in my family likes sweets.
One's spouse (used modestly by the speaker); husband or wife.
うちは先月から新しい仕事を始めました。
My spouse started a new job last month.
うちの者がそちらへ伺います。
My husband/wife will come to see you.
お忙しいところ、うちのためにありがとうございます。
Thank you for doing this for my family/spouse despite being busy.
A notation used after a husband's name in letters to indicate the wife signed on his behalf (written as '内' after the husband's name).
宛名に『山田太郎 内』と書かれていたので、妻が代筆したのだろう。
The address read 'Yamada Taro 内', so his wife probably wrote it on his behalf.
A Kansai-dialect first-person pronoun meaning 'I' or 'me', mainly used by women and children.
うち、今日学校休むねん。
I'm skipping school today.
うち、あの絵好きやねん。
I like that picture.
Archaic: the imperial palace grounds or inner court (historical usage).
昔の文献には『内に参る』とあり、宮中へ上がる意だ。
Old texts say 'to go into the 内', meaning to enter the imperial court.
Archaic: the emperor. Used in historical or literary contexts in modern times.
古い記録では『内は行幸せり』という表現が見られる。
In old records you can see expressions like 'the 内 made a tour' (referring to the emperor).