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

subordinate or inferior in position, rank, or importance

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

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