interesting question!

thinking back on student days, one point of clarification to the question might be: poetic meaning or philosophic meaning?

for instance—if i recall correctly—if poetic or rhetorical meaning is the focus, classical latin may be a contender as words can carry multiple meanings by means of context in a sentence and by declension. latin has a smaller vocabulary than attic greek, so words have more associations, and masters of the language get precision through grammar and association.

alternatively, attic greek is more precise and perhaps more meaningful than latin philosophically, as words can conjoin themselves in novel ways (kind of like german) to make new or more well-defined concepts.

it’s been years since i studied this stuff, so please feel free to correct my misunderstandings