articulateness, command of language, command of words, effective style, eloquence, eloquent tongue, expression, expressiveness, facundity, felicitousness, felicity, gift of expression, gift of gab, glibness, graphicness, intelligibility, interpretability, meatiness, oratory, pithiness, pregnancy, readability, rhetoric, sententiousness, significance, significancy, significantness, silver tongue, slickness, smoothness, suggestiveness, vividness

For further exploring for "meaningfulness" in Webster Dictionary Online