secondhand (Adjective) — Derived from what is primary or original; not firsthand. ex. "a secondhand report" ex. "a secondhand account of a memory of something once read" ex. "most of our knowledge is secondhand"
secondhand (Adjective) — Previously used or owned by another. ex. "bought a secondhand car"
secondhand (Noun) — An intermediate person; used in the phrase 'at second hand'. ex. "he could learn at second hand from books"
secondhand (Noun) — Hand marking seconds on a timepiece.
secondhand (Adverb) — By indirect means. ex. "I heard about it only secondhand or thirdhand" ex. "he prefers to buy secondhand"
secondhand (Adverb) — From a source of previously owned goods. ex. "I prefer to buy second hand"