14 meanings: 1. a. having lived, existed, or been made or known for a relatively short time b. (as collective noun; preceded by.... Click for more definitions. YOUNG definition: 1. having lived or existed for only a short time and not old: 2. young people generally: 3. an…. Learn more. Define young . young synonyms, young pronunciation, young translation, English dictionary definition of young . adj. young ·er , young ·est 1. Being in an early period of life, development, or growth. 2. Newly begun or formed; not advanced: a young biotech company. Find images of Young Girls Royalty-free No attribution required High quality images.