The second (symbol: s) is a unit of time derived from the division of the day, first into hours, then into minutes, and lastly into seconds, for a total of 24 × 60 × 60 = 86400 seconds per day. "Minute" comes from Latin: pars minuta prima, meaning 'first small part', i.e., first division of the hour – dividing it into sixty, and "second" comes from pars minuta secunda, 'second small part', dividing again into sixty.

Source: Wikipedia