Hypertext Webster Gateway: "seconder"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Seconder \Sec"ond*er\, n.
One who seconds or supports what another attempts, affirms,
moves, or proposes; as, the seconder of an enterprise or of a
motion.
From WordNet (r) 1.7 (wn)
seconder
n : someone who endorses a motion or petition as a necessary
preliminary to a discussion or vote
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