Next after the first in place, time, or value.
The unit of time in the → International System of Units;
symbol s. It is defined by taking the fixed numerical
value of the cesium frequency ΔνCs, the unperturbed
→ ground state
→ hyperfine transition
→ frequency
of the → cesium-133 atom, to be 9 192 631 770 when expressed in the
unit → hertz (Hz), which is equal to s-1.
Etymology (EN): M.E., from O.Fr. second, from L. secundus “following, next in
order,” from root of sequi “to follow;”
PIE base *sekw- “to follow;” cf. Pers. az from;
Mid.Pers. hac “from;”
Av. hac-, hax- “to follow,” hacaiti “follows”
(O.Pers. hacā “from;” Av. hacā “from, out of;”
Skt. sácā “with”); Skt. sácate
“accompanies, follows;” Gk. hepesthai “to follow;”
Lith. seku “to follow.”
Etymology (PE): 1) Dovom, dovomin “ordinal number of do,
two” (Mid.Pers. do; Av. dva-; cf.
Skt. dvi-; Gk. duo; L. duo; (Fr. deux; E. two;
Ger. zwei).
2) Sâniyé, from Ar. sâniyat (feminine) “second.”
