true meaning; real significance
Refers to the genuine, underlying meaning or significance of something, often in contrast to a superficial interpretation.
It is difficult to understand the true meaning of this word.
He thought more deeply about the real significance of that event than anyone else.
意義 means 'meaning' or 'significance' in a general sense; 真意義 adds the nuance of 'true' or 'real' meaning.
Compound of 真 (しん, 'true') and 意義 (いぎ, 'meaning, significance'). The exact historical derivation is uncertain, but the word is formed from standard Sino-Japanese elements.