入

Wikimedia Commons has more media related to:

入

Stroke order

See images of
Radical 11 入

入 (Kangxi radical 11, 入+0, 2 strokes, cangjie input 人竹 (OH), four-corner 8000₀, composition ⿹乀丿)

1. Kangxi radical #11, ⼊.

• Appendix:Chinese radical/入
• 叺 圦 扖 𣱿 込 杁 釞 魞 鳰 內 㐈 屳 㠳 籴 肏 䓥 㞥 㚒 㒼

• Kangxi Dictionary: page 125, character 32
• Dai Kanwa Jiten: character 1415
• Dae Jaweon: page 266, character 18
• Hanyu Da Zidian (first edition): volume 1, page 102, character 1
• Unihan data for U+5165

• 入 on Wikidata.Wikidata

Historical forms of the character 入
Shang	Western Zhou	Warring States	Shuowen Jiezi (compiled in Han)	Liushutong (compiled in Ming)
Oracle bone script	Bronze inscriptions	Chu slip and silk script	Small seal script	Transcribed ancient scripts
Oracle bone script j13031 j13032 j13033 j13034 j13035 j13036 j13037 j13038 j13039 j13040 j13041 j13042 j13043 j13044 j13045 j13046 j13047 j13048 j13049 j13050 j13051 j13052 j13053 j13054 j13055 j13056 j13057 j13058 j13059 j13060 j13061 File:ACC-j13062.svg j13062 j13063 j13064 j13065 j13066 j13067 j13068 j13069 j13070 j13071 j13072 j13073 j13074 j13075 j13076 j13077 j13078 j13079 j13080 j13081 j13082 j13083 j13084 j13085 j13086 j13087 j13088 j13089 j13090 j13091 j13092 j13093 j13094 j13095 j13096 j13097 j13098 j13099 j13100 j13101 j13102 j13103 j13104 j13105 j13106 j13107 j13108 j13109 j13110 j13111 j13112 j13113 j13114 j13115 j13116 j13117 j13118 j13119 j13120 j13121 j13122 j13123 j13124 j13125 Bronze inscriptions b08057 b08058 b08059 b08060 b08061 b08062 b08063 b08064 b08065 b08066 b08067 b08068 b08069 b08070 b08071 b08072 b08073 b08074 b08075 b08076 Small seal script s03777 Transcribed ancient scripts L38521 L38522 L29087 L29088 L29089 L29090 L29091 L29092
References: Mostly from Richard Sears' Chinese Etymology site (authorisation), which in turn draws data from various collections of ancient forms of Chinese characters, including: Shuowen Jiezi (small seal), Jinwen Bian (bronze inscriptions), Liushutong (Liushutong characters) and Yinxu Jiaguwen Bian (oracle bone script).

Ideogram (指事) - an arrowhead indicating "to enter".

Compare 人 (rén).

From Proto-Sino-Tibetan *nup ~ nip. Cognate with Tibetan ནུབ (nub, “to fall (gradually), sink, to set; to decay, to decline”) and Burmese နိပ် (nip, “to decline (e.g. price); to be suppressed, to settle, to be quelled”).

Chinese characters belonging to the same word family include:

• 納 (OC *nuːb, “to make enter”)
• 內 (OC *nuːbs, “inside”)
• 軜 (OC *nuːb, “reins on the inside of the horse”)
• 妠 (OC *nuːms, *nuːb, *rnoːd, “to marry (a girl)”)
• 躡 (OC *neb, “to tiptoe, tread”)
• 攝 (OC *neːb, *ʔnjeb, “to take in, photograph, grasp”)
• 鑷 (OC *neb, “tweezers, forceps”)
• and potentially Cantonese 擸 (laap3, “to bring together, to collect”)

The regular Mandarin pronunciation as predicted from Middle Chinese is rì. The irregular sound change is for taboo reasons - to avoid homophony with its derived vulgar meaning "to enter > to have sexual intercourse", nowadays represented by 日 (rì).

入

1. to enter; to go into

   入嚟坐啦！ [Cantonese]  ―  jap⁶ lai⁴ co⁵ laa¹!   ―  Come in and sit!

   入春  ―  rùchūn  ―  to enter into spring

   病從口入，禍從口出 [MSC, trad.]
   病从口入，祸从口出 [MSC, simp.]

   bìng cóng kǒu rù, huò cóng kǒu chū

   illness comes in via the mouth because of food and trouble goes out via the mouth because of words

   Synonym: 進／进 (jìn)

   Antonym: 出 (chū)

2. to join; to become a member of

   加入  ―  jiārù  ―  to join

   入黨／入党  ―  rùdǎng  ―  to join a political party

3. (literary) to accept; to admit
4. (literary) to pay
5. income

   收入  ―  shōurù  ―  income

   歲入／岁入  ―  suìrù  ―  annual income

6. to confirm; to agree

   入情入理  ―  rùqíngrùlǐ  ―  to be fair and reasonable

7. to arrive (at); to attain
8. (literary) to enter the imperial government and become an official
9. (telephony) to get through

   Synonym: 通

10. (Cantonese) in; inside

    Antonym: 出 (Cantonese)

    入面 [Cantonese]  ―  jap⁶ min⁶   ―  inside

11. (Cantonese) to stock up on
12. (Cantonese) to submit

    入表 [Cantonese]  ―  jap⁶ biu²   ―  to submit a form to the government

13. (Cantonese) to input; to enter; to type into a computer

    入分 [Cantonese]  ―  jap⁶ fan¹   ―  to input scores

    入資料／入资料 [Cantonese]  ―  jap⁶ zi¹ liu^6-2   ―  to enter data

14. (Cantonese, Hokkien) to put something into

    入信封 [Cantonese]  ―  jap⁶ seon³ fung¹   ―  (please add an English translation of this usage example)

    入袋 [Cantonese]  ―  jap⁶ doi^6-2   ―  (please add an English translation of this usage example)

15. (literary, dialectal Mandarin, dialectal Wu, vulgar) to fuck; to have sexual intercourse

    Synonym: 日

16. (Chinese phonetics) Short for 入聲／入声 (rùshēng, “the checked tone”).

    陽入／阳入  ―  yángrù  ―  light checked tone

17. (retail, usually after a number and optional classifier) piece (inside packaging); n-pack

    10入  ―  10 rù  ―  10-pack

    100枚入  ―  100 méi rù  ―  100 pieces

    6罐入  ―  6 guàn rù  ―  6 cans pack

    10入/盒,5元/入  ―  10 rù / hé, 5 yuán / rù  ―  10 pieces per box, 5 yuan per piece

• “入”, in 漢語多功能字庫 (Multi-function Chinese Character Database)‎, 香港中文大學 (the Chinese University of Hong Kong), 2014–

(First grade kyōiku kanji)

1. to enter
2. to insert

• Go-on: にゅう (nyū, Jōyō)^{←にふ (nifu, historical)}
• Kan-on: じゅう (jū)^{←じふ (zifu, historical)}
• Kan’yō-on: じゅ (ju)、にっ (ni')^{←にふ (nifu, historical)}
• Kun: いる (iru, 入る, Jōyō)、いり (iri, 入り)、いれる (ireru, 入れる, Jōyō)、はいる (hairu, 入る, Jōyō)^{←はひる (fafiru, 入る, historical)}、しお (shio)^{←しほ (sifo, historical)}
• Nanori: いり (iri)、いる (iru)、しほ (shiho)、なり (nari)

The 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 入(い)る (iru, “to go in, to be in”)..^[1][2][3][4]

Attested as a standalone noun since the early 1200s.^[2]

• (Tokyo) いり (Heiban – )^[3][4][5]
• IPA^(key):

入(いり) • (iri) 

1. entering, going in
2. setting, such as a sunset or moonset (from the idea of the sun or moon going into the horizon)
3. the beginning or first day of a period of time
4. income, takings

   Synonym: 収入 (shūnyū)

5. a subtotal or portion of some larger payment amount

   Synonym: 内金 (uchikin)

6. an expense, an amount needed
7. the amount of people or things that fit into a space: capacity; admission, admittance

   Synonyms: 容量 (yōryō, capacity), 入場者数 (nyūjō shasū, admission, number of people who have entered)

8. "on" switch, the "on" position for a switch

   Antonym: 切 (kiri)

入(しお) • (-shio) 

1. (archaic) counter for soakings (of fabric in a dye)

From Middle Chinese 入 (MC nyip).