Science, Tech, Math › Science Deposition Definition Chemistry Glossary Definition of Deposition Share Flipboard Email Print There is more than one definition for deposition in science. David Freund/Getty Images Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry in Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate by Anne Marie Helmenstine, Ph.D. Updated March 08, 2017 Deposition Definition: The settling of particles or sediment onto a surface. The particles may originate from a vapor, solution, suspension, or mixture. Deposition also refers to the phase change from gas to solid. Return to the Chemistry Glossary Index Continue Reading