noun
jukujikun; special kanji compound reading
A reading assigned to a kanji compound where the characters relate to the meaning but not the pronunciation; e.g. 昨日 (きのう), 大人 (おとな). Used in Japanese linguistics.
「熟字訓」とは、漢字の意味に合う和語を当てた読み方のことです。
Jukujikun is a reading where a native Japanese word is matched to the meaning of the kanji compound.
「明日」を「あした」と読むの
Reading 明日 as あした is also an example of jukujikun.
Kun'yomi is a native Japanese reading for a single kanji, whereas jukujikun applies to a compound as a whole.
From 熟字 (jukuji, 'kanji compound') + 訓 (kun, 'native Japanese reading'). The term describes a reading where the whole compound is read with a native Japanese word that matches its meaning, rather than by combining the individual character readings.