Adjective
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previously used or owned by another
"bought a secondhand (or used) car"
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derived from what is primary or original
not firsthand
"a secondhand report"
"a secondhand account of a memory of something once read"
"most of our knowledge is secondhand"
Adverb
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by indirect means
"I heard about it only secondhand or thirdhand"
"he prefers to buy secondhand"