means A second is the basic unit of time equal to one-sixtieth of a minute, or it can mean the one coming after the first in order or rank, or to formally support a motion.

from From Latin 'secundus,' meaning 'following' or 'next' — literally that which 'follows' the first (rooted in 'sequi,' to follow, also behind 'sequence' and 'second' as a verb). The time unit comes from medieval Latin 'secunda minuta,' the 'second small part' of an hour: the hour was first divided into sixty 'minute' (small) parts, then each of those divided again — the second division, hence 'second.'