大同

Wikipedia has articles on:

• 大同 (Written Standard Chinese^?)
• 大同 (Cantonese)
• 大同 (Classical)
• Dâi-dùng (Eastern Min)
• Tāi-tông (Southern Min)
• 大同市 (Wu)

The philosophical sense is from the Book of Rites, Book 9 (《禮記·禮運》):

……是故謀閉而不興，盜竊亂賊而不作，故外戶而不閉，是謂大同。 [Classical Chinese, trad.]

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……是故谋闭而不兴，盗窃乱贼而不作，故外户而不闭，是谓大同。 [Classical Chinese, simp.]

From: The Book of Rites, c. 4^th – 2^nd century BCE, translated based on James Legge's version

...... Shìgù móu bì ér bù xīng, dàoqiè luànzéi ér bù zuò, gù wàihù ér bù bì, shì wèi dàtóng.

… In this way (selfish) schemings were repressed and found no development. Robbers, filchers, and rebellious traitors did not show themselves, and hence the outer doors remained open, and were not shut. This was (the period of) what we call the Grand Union.

大同

1. (Chinese philosophy) Great Unity (utopian vision of the world in which everyone and everything is at peace)
2. (formal) significant similarities
3. (～卦) A combination 四上三中四下 in the Lingqijing.
4. (Taiwanese Hokkien, chiefly Tainan and Magong Hokkien) green pepper

• (green pepper): 青椒 (qīngjiāo); (Hokkien) 大同仔, 青番薑／青番姜

大同

1. (～市) Datong (a prefecture-level city in Shanxi, China)
2. (～縣) (historical) Datong (a former county of Datong, Shanxi, China; modern Yunzhou District)
3. (～區) Datong (a district of Taipei, Taiwan)
4. (～區) Datong District (a district of Daqing, Heilongjiang, China)
5. (～鄉) Datong Township (various townships in Mainland China)
6. (～鄉) Datong (a mountain indigenous township in Yilan County, Taiwan)
7. (～鎮) Datong Town (various towns in Mainland China)
8. (～社區) Datong (a residential community of Zhicheng, Yidu, Yichang, Hubei, China)
9. (historical) the Datong era (a Chinese era name):
   1. The fifth era of Emperor Wu of Liang, from 535 to 546.
   2. The third era of Emperor Wuxuan of Dafengmin (formerly Nanzhao), ending in 888.
   3. The third era of Emperor Taizong of Liao, in 947.
   4. The second era of Puxian Wannu as emperor of Eastern Xia, from 1224 to 1233.
   5. The era of Puyi as chief executive of the Japanese puppet state of the State of Manchuria (Manchukuo), from 1932 until his enthronement as emperor with the establishment of the Empire of Manchuria in 1934.

• 康德 (Kāngdé) (era name of Manchukuo from 1934–45)

• → English: Datong, Tatung

• “Entry #52598”, in 臺灣閩南語常用詞辭典 [Dictionary of Frequently-Used Taiwan Minnan] (overall work in Mandarin and Hokkien), Ministry of Education, R.O.C., 2023.

大(だい)同(どう) • (daidō) 

1. roughly the same
2. unity with a common goal

• 大同小異(だいどうしょうい) (daidōshōi)
• 大同団結(だいどうだんけつ) (daidōdanketsu)

 大同 (日本) on Japanese Wikipedia

 Daidō on Wikipedia

大(だい)同(どう) • (Daidō) 

1. the Daidō era, 806-810
2. Datong (a city in Shaanxi, China)

• 延暦(えんりゃく) (Enryaku) (era preceding Daidō)
• 弘仁(こうにん) (Kōnin) (era following Daidō)