GG5: a friendly [an informal, a relaxed] talk; a (friendly) chat; a (relaxed) conversation.

The mixture of "informal" and "(informal)" looked odd. I think this is simpler.

@@ -18,6 +18,3 @@
-<xref type="see" seq="1289910">懇談会</xref>
-<xref type="see" seq="1289910">懇談会</xref>
-<gloss>(informal) meeting</gloss>
-<gloss>informal discussions</gloss>
-<gloss>informal talks</gloss>
-<gloss>(friendly) conversation</gloss>
+<gloss>friendly chat</gloss>
+<gloss>relaxed conversation</gloss>
+<gloss>informal meeting</gloss>

懇談	1350062	99.8%
を懇談	2682	0.2%
sankoku says [vi] only 

https://www.wordreference.com/jaen/懇談
懇談 conversation, discussion

懇談	1349708	  
懇談会	987179	 

天皇皇后両陛下とジョコ大統領ゴルフカート懇談へ　インドネシア訪問
https://newsdig.tbs.co.jp/articles/-/550127

With pictures of the two women having this encounter:
岸田首相夫人 ホワイトハウスでバイデン大統領夫人と懇談
https://www3.nhk.or.jp/news/html/20230418/k10014041611000.html

岸田首相、ゼレンスキー氏との会談見送り　舞台裏で懇談 <-- 
https://www.sankei.com/article/20230713-YIFQ7NXM65IUNODNW34JMKYQLA/
首脳の共同宣言発表式典の舞台裏で控えている時間に懇談したという。ロシアに侵略されているウクライナへの連帯を表明したとみられる。

https://eow.alc.co.jp/search?q=懇談
hobnobbing

https://www.ldoceonline.com/Literature-topic/informal
"The two groups met for informal talks."

Plural on purpose, as in "the two leaders met Tuesdays for informal discussions".  I think I would also have pluralized "informal talks"(as in the longman ref, "The two groups met for informal talks.").  

The most common gloss on reverso, with or without 会, is simply "meeting".

@@ -17 +16,0 @@
-<pos>&vt;</pos>
@@ -19 +18,6 @@
-<gloss>informal talk</gloss>
+<xref type="see" seq="1289910">懇談会</xref>
+<xref type="see" seq="1289910">懇談会</xref>
+<gloss>(informal) meeting</gloss>
+<gloss>informal discussions</gloss>
+<gloss>informal talks</gloss>
+<gloss>(friendly) conversation</gloss>

Meikyo vt and vi additions to n,vs entries
-*- via bulkupd.py -*-

@@ -16,0 +17,2 @@
+<pos>&vt;</pos>
+<pos>&vi;</pos>