constituting number two in a sequence; coming after the first in time or order; 2nd

he married for a second time

Herbert was the second of their six children

the second of October

the second-youngest player

subordinate or inferior in position, rank, or importance

it was second only to Copenhagen among Baltic ports

he is a writer first and a scientist second

an attendant assisting a combatant in a duel or boxing match

formally support or endorse (a nomination or resolution or its proposer) as a necessary preliminary to adoption or further discussion

Bridgeman seconded Maxwell's motion calling for the reform

a sixtieth of a minute of time, which as the SI unit of time is defined in terms of the natural periodicity of the radiation of a caesium-133 atom

a sixtieth of a minute of angular distance

transfer (a military officer or other official or worker) temporarily to other employment or another position

I was seconded to a public relations unit