jmdict 1161050 Active (id#2287949)
一意専心； 一意摶心 [rK]
【 いちいせんしん 】
  1. [adv,n,adj-no] [yoji]
    • single-mindedly
    • wholeheartedly
    • with all one's heart
    • with one's heart and soul
    Cross references:
    • ⇐ see: 1161040 一意【いちい】 2. wholeheartedly; single-mindedly; devotedly
History:
    • A 2024-01-09 00:53:47 Jim Breen (id#2287949)
    • Comments
      OK
    • A* 2024-01-08 21:35:07 Stephen Kraus (id#2287928)
    • Comments
      Definitely rare, but I think it's attested enough to include.
    • Refs
      The 摶 form of this yoji is also recorded in the second edition of 新漢語林 by Taishukan (the publisher of meikyo).

Wiktionary has it in the Chinese source text for this yoji.
https://ja.wiktionary.org/wiki/一意専心

Google N-gram Corpus Counts
╭─ーーーーーーー─┬───────╮
│ 一意専心　　　 │ 5,846 │
│ 一意專心　　　 │     0 │ - (kyūjitai of 専)
│ 一意摶心　　　 │     0 │ - (nominally unrelated kanji 摶)
│ いちいせんしん │   249 │
╰─ーーーーーーー─┴───────╯
    • Diff
      @@ -5,0 +6,4 @@
+</k_ele>
+<k_ele>
+<keb>一意摶心</keb>
+<ke_inf>&rK;</ke_inf>
    • A 2023-04-07 17:28:23 Robin Scott (id#2228139)
    • Comments
      It's in some of the other online yojijukugo dictionaries so it's probably not a mistake. But it is absent from the kokugos as well as sanseido's and gakken's yojijukugo dictionaries. Given this, plus its rarity, I don't think it's worth adding.
    • Refs
      gg5
    • Diff
      @@ -10,0 +11 @@
+<pos>&adv;</pos>
@@ -13 +13,0 @@
-<pos>&adv;</pos>
@@ -16,0 +17 @@
+<gloss>with all one's heart</gloss>
    • A 2023-04-07 03:46:01 Jim Breen (id#2228063)
    • Comments
      The kanji aren't related. I think it's a mistake.
    • Refs
      専心	37527
摶心	0
    • Diff
      @@ -6,4 +5,0 @@
-</k_ele>
-<k_ele>
-<keb>一意摶心</keb>
-<ke_inf>&rK;</ke_inf>
    • A* 2023-04-07 02:28:49 Stephen Kraus (id#2228045)
    • Comments
      Worth adding?
    • Refs
      Google N-gram Corpus Counts
╭─ーーーーーーー─┬───────┬───────╮
│ 一意専心　　　 │ 5,846 │ 95.9% │
│ 一意摶心　　　 │     0 │  0.0% │ - add, rK (jitenon)
│ いちいせんしん │   249 │  4.1% │
╰─ーーーーーーー─┴───────┴───────╯
    • Diff
      @@ -5,0 +6,4 @@
+</k_ele>
+<k_ele>
+<keb>一意摶心</keb>
+<ke_inf>&rK;</ke_inf>
  6. (show/hide 2 older history records)
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