1. One that supports what another attempts; the supporter of a motion.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• secoundes,
• secondon,
• secondayr,
• secondry,
• secondy,
• seconda,
• secondas,
• secondar,
• seconed,
• secondery,
• secondrey,
• secondis,
• secondaey,
• secondnew,
• secondely,
• secondart,
• secondes,
• seconday,
• secondth,
• seeconder

• second deck,
• secondary,
• secondguess,
• second best,
• secondhand,
• secondo,
• secondarily,
• second-year,
• secondly,
• secondment,
• second base,
• seasoned,
• second wind,
• second,
• second half,
• second gear,
• Segundo,
• second-best,
• second-rate,
• second hand.

The adjective form of the word "seconder" is "seconding".

The plural of the "seconder" can be the "seconders".

The singular of the "seconder" can be the "seconder".