Great Prince - Okimi

Japanese: 大君 - おおきみ

〘Noun〙 (also "Ogimi")① A respectful term for the Emperor. ※Kojiki (712), Vol. 2, folk song "Even if I live alone on the single reed of Hatta, If I hear that Ohokimi is good, Even if I live alone"② A respectful term for princes, kings, princesses, and other descendants of the Emperor. ※Kojiki (712), Vol. 2, folk song "The high-shining sun god rests peacefully, my Ohokimi "③ A respectful term used especially for kings who were not proclaimed princes or registered as subjects. A counter term to calling a prince or princess "miko". ※Engishiki (927) Norito, June 30th Great Purification (Kujo Family Main Instruction) "The princes , kings , ministers, and hundreds of officials gathered together, all of you are declaring , 'Listen to me! '" ④ The supreme ruler. The great king. ※Bussokuseki (Poem of the Buddha's Footprint) (around 753) "This body, like the light of thunder, is always with the mortal Oho-kimi. Isn't it fearful?" ⑤ Used to respect a person of high rank. ※Saibaraku (late 7th century - 8th century) My family "My family's curtains are hanging down , so please bring Oho-kimi to be my son-in-law." ⑥ Used to respect the lord. ※Kokunodai Senki (1575) "Ohogimi Yoshiaki and his younger brother Motoyori and Wakagimi" [Eloquence] (1) ① is a title of respect for the Emperor, the highest rank and head of state, and is not a name of rank, but is a title of respect for the Emperor, the highest rank and head of state, by adding the honorific "oho" to the honorific "kimi" for the leader of a clan or group. It is used in kanji as "king" or "great king," and honorifics for male and female members of the imperial family such as "king" and "princess" are also read as "ohokimi." The example of ④, "Ohokimi of Death" in "Butsokusekika" is read as the Chinese word "great king."
(2) From the Middle Ages onwards, kings were called “Ookimi” in contrast to imperial princes (miko) (as in ③), and the term came to be used broadly to refer to people of high status as well (as in ⑤ and ⑥).

Tai-kun [Big Prince]

〘Noun〙① A word to show respect to a sovereign. Son of Heaven. ※Essay, Oritaku Shiba no Ki (around 1716) says, "Taikimi is another name for Tenno, and appears in books from other dynasties." [Book of Changes - Master Hexagram]② Another title for the Tokugawa Shogun used when speaking to foreigners during the Edo period. His Imperial Highness the Great. ※Shokai Shingo (1676) 7 "The Emperor is not particularly pleased, and we are not so broad-minded."③ In China, the title of Zongjinfu Shoichinin, bestowed on the eldest son of the king. ※Essay, Oritaku Shiba no Ki (around 1716) says, "Taikimi is the title bestowed on his subjects in that country."

Ooigi miohoi [Great Prince]

〘Noun〙 A word used to show respect for the eldest daughter of a noble. The first elder sister. Oiko . ※Yamato (around 947-957) 118 "Kan'in no Ooi-kimi"

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙 (「おおぎみ」とも)① 天皇を尊敬していう。※古事記（712）下・歌謡「八田の一本菅(ひともとすげ)は独り居りとも意富岐彌(オホキミ)しよしと聞こさば独り居りとも」② 親王、王、王女など、天皇の子孫を尊敬していう。※古事記（712）中・歌謡「たか光るひのみこやすみししわが意富岐美(オホキミ)」③ 特に、親王宣下もなく臣籍にもはいらない諸王を尊敬していう。親王を「みこ」というのに対する語。※延喜式（927）祝詞・六月晦大祓（九条家本訓）「集侍(うこなはりはべ)る親王(みこたち)・諸王（大君達）・諸臣（まち君達）・百の官人達、諸聞食(ききたまへよ)と宣(のたま)ふ」④ 最上の支配者。大王。※仏足石歌（753頃）「雷の光の如きこれの身は死の於保岐美(オホキミ) 常に偶へり畏づべからずや」⑤ 身分のある人を尊敬していう。※催馬楽（７Ｃ後‐８Ｃ）我家「我家(わいへ)は帷帳(とばりちゃう)も垂れたるを於保支美(オホキミ)来ませ聟にせむ」⑥ 主君を尊敬していう。※国府台戦記（1575）「おほぎみ義明をはじめ奉り、御舎弟元頼、わかぎみ両三人」[語誌](1)①は氏族や集団の統率者に対する敬称「きみ」に美称の「おほ」を冠して、最上の身分、国家の元首たる天皇に対する敬称としたもので、身分の名称ではない。漢字として「王・大王」などをあて、皇族の男女の敬称「王、王女」等も「おほきみ」と読まれる。④の挙例「仏足石歌」の「死のおほきみ」は、漢語の「大王」の訓である。
(2)中古以降は③のように、親王(みこ)に対して諸王を「おほきみ」といい、また⑤⑥のように、身分のある人をも広く指して言うようになった。

たい‐くん【大君】

〘名〙① 君主を敬っていう語。天子。※随筆・折たく柴の記（1716頃）中「大君は天子の異称なる由、異朝の書にはみえたり」〔易経‐師卦〕② 江戸時代、外国に対して用いた徳川将軍の別号。大君殿下。※捷解新語（1676）七「たいくんもことのほかよろこびなのめならず、われらめんもくひろいなく」③ 中国で、宗親府正一品の職号で、国王の嫡子に授けられるもの。※随筆・折たく柴の記（1716頃）中「大君といふは、彼国にして、その臣子に授くる所の職号にこそあれ」