true meaning; original meaning; underlying principle
Refers to the fundamental or original meaning of a word, concept, or principle, as opposed to a derived or superficial interpretation. Often used in academic or explanatory contexts.
The original meaning of this word is rarely used today.
His argument goes against the true intent of the law.
本義 refers to the original or true meaning of a word or concept, while 第一義 refers to the most important principle or significance of something in general.
Compound of 本 (ほん, 'origin, true') and 義 (ぎ, 'meaning, righteousness'). The exact historical derivation is uncertain, but the spelling is conventionally associated with the sense of fundamental meaning.