Simple past tense and past participle of second.(verb)
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Use "seconded" in a sentence
"Throwing around “racism” charges unless your very specific sensibilities are seconded is cheap argument."
"BTW I nominate Ted Chiang for Ace's Mammoth Book of Mindblowing Science Fiction by the Rest of Us, Connie Willis, Nancy Kress, LeGuin seconded yet again, Pat Cadigan, Maureen McHugh (does she do short fiction?), Caitlin Keirnan, Linda Nagata, and that's just from a fast scan of my front layer of bookshelf."
"Overlooked, IMO (many seconded from the comments above):"