<p><strong>Adjective:</strong></p><ul><li>consisting of or forming a large mass; bulky and heavy: massive columns.</li><li>large and heavy-looking: a massive forehead.</li><li>large in scale, amount, or degree: a massive breakdown in communications; massive reductions in spending.</li><li>solid or substantial; great or imposing: massive erudition.</li><li>having no outward crystal form, although sometimes crystalline in internal structure.</li></ul><p><strong>Noun:</strong></p><ul><li>a body of coherent matter, usually of indefinite shape and often of considerable size: a mass of dough.</li><li>an abnormal lump in the body, often in the form of a cyst or tumor: The mass they removed was alarmingly large, but the great news is that it was benign.</li><li>a collection of incoherent particles, parts, or objects regarded as forming one body: a mass of sand.</li><li>a considerable assemblage, number, or quantity: a mass of troops.</li><li>the quantity of matter as determined from its weight or from Newton's second law of motion.</li></ul><p><strong>Verb (used without object):</strong></p><ul><li>to come together in or form a mass or masses: The clouds are massing in the west.</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>to gather into or dispose in a mass or masses; assemble: The houses are massed in blocks.</li></ul>