1. second hand, mediator, go-between, intermediator, intermediary, intercessor
usage: an intermediate person; used in the phrase `at second hand'; "he could learn at second hand from books"
2. second hand, hand
usage: hand marking seconds on a timepiece
Adjective
1. secondhand, secondary (vs. primary)
usage: 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"
2. secondhand, used, old (vs. new)
usage: previously used or owned by another; "bought a secondhand (or used) car"
Adverb
1. second hand
usage: from a source of previously owned goods; "I prefer to buy second hand"
Adverb
1. second hand
usage: by indirect means; "I heard about it only secondhand or thirdhand"; "he prefers to buy secondhand"