<p><strong>Adjective</strong></p><ul><li>solider, solidest</li><li>having three dimensions (length, breadth, and thickness), as a geometrical body or figure.</li><li>of or relating to bodies or figures of three dimensions.</li><li>having the interior completely filled up, free from cavities, or not hollow: a solid piece of chocolate.</li><li>without openings or breaks: a solid wall.</li><li>firm, hard, or compact in substance: solid ground.</li><li>having relative firmness, coherence of particles, or persistence of form, as matter that is not liquid or gaseous: solid particles suspended in a liquid.</li><li>pertaining to such matter: Water in a solid state is ice.</li><li>dense, thick, or heavy in nature or appearance: solid masses of cloud.</li><li>not flimsy, slight, or light, as buildings, furniture, fabrics, or food; substantial.</li><li>of a substantial character; not superficial, trifling, or frivolous: a solid work of scientific scholarship.</li><li>without separation or division; continuous: a solid row of buildings.</li><li>whole or entire: one solid hour.</li><li>forming the whole; consisting entirely of one substance or material: solid gold.</li><li>uniform in tone or shades, as a color: a solid blue dress.</li><li>real or genuine: solid comfort.</li><li>sound or reliable, as reasons or arguments: solid facts.</li><li>sober-minded; fully reliable or sensible: a solid citizen.</li><li>financially sound or strong: Our company is solid.</li><li>thoroughly, vigorous, great, big, etc. (with emphatic force, often after good): a good solid blow.</li><li>firmly united or consolidated: a solid combination.</li><li>united or unanimous in opinion, policy, etc.</li><li>on a friendly, favorable, or advantageous footing (often preceded by in): He was in solid with her parents.</li><li>excellent, especially musically.</li></ul><p><strong>Noun</strong></p><ul><li>a body or object having three dimensions (length, breadth, and thickness).</li><li>a solid substance or body; a substance exhibiting rigidity.</li></ul>