The Collaborative International Dictionary of English v.0.48:
meaningful \meaningful\ adj. Having a meaning or purpose; having significance; as, a meaningful explanation; a meaningful discussion; a meaningful pause; to live a meaningful life. Opposite of meaningless. [Narrower terms: comprehensible, understandable; indicative, significative, suggestive ; {meaty, substantive ; {purposeful] Also See: purposeful, significant, important. [WordNet 1.5]WordNet (r) 3.0 (2006):
meaningful adj 1: having a meaning or purpose; "a meaningful explanation"; "a meaningful discussion"; "a meaningful pause" [ant: meaningless, nonmeaningful]