seconder

noun

1. (in-compounds)Something that lasts or takes a specified number of seconds.

   “I'm a post-first-weight-gain-in-ten-years, post-obsessing-about-food-every-minute-of-every-day, and life is different. It really is. I still struggle sometimes, but I can honestly say that the tapes are no longer playing. Once in a while I hear a little “commercial,” a brief ten-seconder: Are you sure you don't want to lose a little weight? Wouldn't you rather skip that high-fat meal?”

2. The person who makes a second to a motion in any formal procedure, such as a parliamentary procedure.

   “He's been the seconder on many motions, but I don't think he's ever made a motion himself.”

3. A Cub Scout serving as a second-in-command to a sixer.
4. A person who seconds; a person who climbs after the leader