n.
Function: noun
Etymology: Middle English secounde, from Medieval Latin secunda, from Latin, feminine of secundus second; from its being the second sexagesimal division of a unit, as a minute is the first
Date: 14th century
1 a : the 60th part of a minute of angular measure b : the 60th part of a minute of time : 1/86,400 part of the mean solar day specifically : the base unit of time in the International System of Units that is equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom
2 : an instant of time : MOMENT