<p><strong>Noun</strong></p><ul><li>a flowing or flow.</li><li>Synonyms: livestream, flood, current, course.</li><li>the flowing in of the tide.</li><li>continuous change, passage, or movement: His political views are in a state of flux.</li><li>Physics: the rate of flow of fluid, particles, or energy.</li><li>a quantity expressing the strength of a field of force in a given area.</li><li>Chemistry, Metallurgy: a substance used to refine metals by combining with impurities to form a molten mixture that can be readily removed.</li><li>a substance used to remove oxides from and prevent further oxidation of fused metal, as in soldering or hot-dip coating.</li><li>(in the refining of scrap or other metal) a salt or mixture of salts that combines with nonmetallic impurities, causing them to float or coagulate.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to melt; make fluid.</li><li>to fuse by the use of flux.</li><li>Obsolete: to purge.</li><li>(used without object) to flow.</li></ul>