n. The person who makes a second to a motion in any formal procedure, such as a parliamentary procedure.
the GNU version of the Collaborative International Dictionary of English
n. One who seconds{3} or supports what another attempts, affirms, moves, or proposes.
The Century Dictionary and Cyclopedia
n. One who seconds; one who approves and supports what another attempts, affirms, or proposes: as, the seconder of a motion.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who endorses a motion or petition as a necessary preliminary to a discussion or vote
Word Usage
"The claimant will have both a sponsor as good as a seconder, as good as a sponsor will have certain which multiform members have had a possibility to get to know a claimant improved than a singular can by a discerning sell of pleasantries over cheese prior to dinner."