1. number one
    Domain: Modern Chinese 现代汉语 , Subdomain: Quantity
    Notes: In this sense, 一 is used in counting items (Guoyu '一' n 1; Kroll 2015 '一' 1, p. 540; NCCED '一' 1; Ho 2002, '一' 1; Rouzer 2007; p. 14). For example, 一个中心 'one center.' (Xinhua Net, 2015-12-25) Tone sandhi 变调 modifies yī to yì when it is followed by a first, second or third tone. For example, 一年 yì nián 'one year'. Also, yī becomes yì when it is followed by a fourth tone. For exmaple, 一条 yì tiáo 'one strand' (Sun 2006, loc. 545). 一 is the 2nd most common word in the 1985 Beijing Language Insititue frequency wordlist (Ho 2002, '一').
  2. noun Kangxi radical 1
    Domain: Modern Chinese 现代汉语 , Subdomain: Radicals
    Notes: (ABC back cover; GHC p. 7)
  3. adverb as soon as; all at once
    Domain: Modern Chinese 现代汉语 , Concept: Correlative 关联词
    Notes: This adverb is often used as a connecting word in the subordinate clause of subordinate complex sentences. It is often used in the pattern 一…,就… to express that if a certain condition is met the result will surely follow (Guoyu '一' adv 1; Kroll 2015 '一' 4, p. 540; NCCED '一' 9; Ho 2002, '一' 2; Li Shaoqi, 2003, pp. 194-195). For example, 一出来,才晓得自己的错误 'As soon as he came out, he realized his own mistake.' (Lao She, 2003, p. 260)
  4. adjective pure; concentrated
    Domain: Modern Chinese 现代汉语
    Notes: (Guoyu '一' adj 3; Kroll 2015 '一' 2, p. 540; NCCED '一' 4)
  5. adverb whole; all
    Domain: Modern Chinese 现代汉语
    Notes: In this sense, 一 is placed in front of nouns to indicate a complete unit (Guoyu '一' adj 4; Kroll 2015 '一' 3, p. 540; NCCED '一' 3; Ho 2002, '一' 3). For example, 一冬天 'throughout the whole winter.' (Lao She, 2003, p. 221)
  6. ordinal first
    Domain: Modern Chinese 现代汉语 , Subdomain: Quantity
    Notes: (Rouzer 2007; p. 14)
  7. adjective the same
    Domain: Modern Chinese 现代汉语
    Notes: In the sense of 一样 (Guoyu '一' adj 2; Kroll 2015 '一' 2b, p. 540; NCCED '一' 2)
  8. adverb each
    Domain: Modern Chinese 现代汉语
    Notes: In the sense of 每 (Guoyu '一' adv 5; NCCED '一' 5)
  9. pronoun certain
    Domain: Modern Chinese 现代汉语
    Notes: (NCCED '一' 6)
  10. adverb throughout
    Domain: Modern Chinese 现代汉语
    Notes: (NCCED '一' 8) For example, 前前后后的一想 'thought about it for a while.' (Lao She, 2003, p. 218; Li Shaoqi, 2003, pp. 195)
  11. adverb used in between a reduplicated verb
    Domain: Modern Chinese 现代汉语
    Notes: (Guoyu '一' adv 6; NCCED '一' 10) For example, 烤一烤 'heat up.' (Lao She, 2003, p. 216)
  12. adjective sole; single
    Domain: Modern Chinese 现代汉语
    Notes: (Guoyu '一' adj 1; Kroll 2015 '一' 1a, p. 540)
  13. adjective a very small amount
    Domain: Modern Chinese 现代汉语
    Notes: (Kroll 2015 '一' 1b, p. 540)
  14. proper noun Yi
    Domain: Modern Chinese 现代汉语 , Subdomain: Names , Concept: Surname 姓氏
    Notes: (Guoyu '一' n 2)
  15. adjective other
    Domain: Literary Chinese 文言文
    Notes: (Guoyu '一' n 7)
  16. verb to unify
    Domain: Literary Chinese 文言文
    Notes: (Guoyu '一' v)
  17. verb accidentally; coincidentally
    Domain: Literary Chinese 文言文
    Notes: In the sense of 偶然 (Guoyu '一' adv 2)
  18. verb abruptly; suddenly
    Domain: Literary Chinese 文言文
    Notes: In the sense of 偶然 (Guoyu '一' adv 3)
  19. conjunction or
    Domain: Literary Chinese 文言文
    Notes: In the sense of 或 (Guoyu '一' conj)

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第一次世界大战一期智慧第一一劫遍观一切色身想观云门一代时教祖国和平统一委员会随一萧一山四一二惨案一二八事变一异

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