(n) :
the
SI unit of
time, defined as the duration of 9,192,631,770 periods of
radiation corresponding to the transition between two hyperfine levels of
caesium-133 in a ground state at a temperature of
absolute zero and at rest; one-
sixtieth of a
minute; a unit of
angle equal to one-sixtieth of a
minute of arc or one part in 3600 of a
degree
"I'll be there in a second."
(v) :
to
agree as a second person to (a proposal), usually to reach a necessary
quorum of
two; transfer temporarily to alternative employment
"I second the motion."