箱の内に手紙が入っている。
There is a letter inside the box.
一時間の内に終わらせます。
I'll finish it within an hour.
while; during; in the course of
Temporal use: marks a period or state during which something happens. Often written in kana.
若いうちにいろいろな経験をしたほうがいい。
You should have various experiences while you are young.
明るいうちに帰りましょう。
Let's go home while it's still light.
Used in the pattern 〜のうち to indicate selection or comparison within a group. Usually written in kana.
この三つのうち、どれが一番好きですか。
Which do you like best among these three?
友達のうちで彼が一番背が高い。
He is the tallest among my friends.
in (a state); amidst; with
Pattern 〜のうちに after a noun representing a state or condition: in secret, in chaos, with success, etc. Also written 裡 or 裏 in literary contexts. Usually written in kana.
成功のうちにプロジェクトを終えた。
We completed the project with success.
混乱のうちに会議が始まった。
The meeting began amidst confusion.
within oneself; one's inner thoughts
Refers to one's inner feelings, thoughts, or heart. Often used in expressions like 心の内 or 胸の内.
彼は心の内をなかなか見せない。
He rarely shows his inner thoughts.
胸の内を打ち明けた。
I opened up about my feelings.
we; our company; our organization
Only when written 内
Humble first-person plural used in business or formal contexts to refer to one's own group. Antonym: そと (outside group). Usually written in kana.
内ではそのように決まっております。
That is what we have decided within our company.
内の者に確認します。
I will check with someone from our organization.
Only when written 内
Refers to one's own home or family. Also written 家. Usually written in kana in modern usage.
See also: うち
今日は内でゆっくりします。
I'll relax at home today.
内の家族はみんな犬が好きです。
Everyone in my family likes dogs.
my spouse; my husband; my wife
Only when written 内
Humble reference to one's own spouse. Gender-neutral but context-dependent.
内の主人は今出かけております。
My husband is out right now.
内の妻がお世話になりました。
My wife has been in your care.
signed on behalf of husband by wife
Only when written 内
Archaic epistolary convention: wife signs a letter after the husband's name using 内. Very rare in modern Japanese.
古い手紙の末尾に「太郎内」と書かれている。
At the end of the old letter, it says 'Tarō uchi', meaning signed by his wife on his behalf.
Only when written 内
Kansai dialect first-person pronoun, primarily used by women and children. Casual and regional.
内、そんなん知らんわ。
I don't know anything about that. (Kansai dialect)
imperial palace grounds; emperor
Only when written 内
Archaic. Refers to the imperial palace or, by extension, the emperor. Not used in modern Japanese outside historical contexts.
内裏の内は一般の者は立ち入れなかった。
Commoners were not allowed inside the imperial palace grounds.
I finished my homework within an hour.
Let's go home before it starts raining.
Three out of the ten people agreed.
My hand was moving unconsciously.
He kept his sadness hidden inside.
This company clearly distinguishes between insiders and outsiders.
家 refers to the physical house or building, while 内 refers to one's home as a personal, familial space.
内 refers broadly to the inside or interior of something, while 奥 emphasizes the deep, far, or hidden part reached only after going further in.
family circle; in-group; one's own circle · private matters; internal affairs · conservative; moderate; on the low side · pigeon toe; in-toeing
shy; bashful; timid; reserved
makuuchi; top sumo division
inner thigh; inside of the thigh · pigeon-toed; toes turned inward · uchi-mata (judo throw)
too; extremely; so; super
palm of one's hand · skill; control; hidden intentions · one's hand (in card games or mahjong)
private; confidential; internal; within a closed group
inner loop; inner track; inner lane
gift for close relatives or friends; return gift for a family celebration · family celebration; private celebration
internal factional violence; infighting within a student group
makunouchi bento; box lunch with rice and assorted side dishes · makuuchi; top division of professional sumo · intermission; interlude between acts
internal conflict; family quarrel; domestic trouble
inner moat; moat within the castle walls
interior lining; inner paneling
lion at home, mouse abroad
indoor hot-spring bath
deposit; money paid on account; bargain money
inner thigh; inside of the thigh
indoor bath; private bath
inside story; lowdown; inner workings · inner curtain (historical military)
bales forming the edge of the sumo ring
godown within a compound; warehouse within a building complex
inside of a helmet; hidden circumstances
inner courtyard; quadrangle
inside pocket; bosom · real intentions; inner thoughts; true state of affairs
internal door; inner door
included number; number within a total
Search-only form; used in the sense of 'amidst' or 'in a state of'.
Rare alternate kanji; 内 is overwhelmingly preferred.