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Second - Wikipedia The second, symbol s, is the SI unit of time It is defined by taking the fixed numerical value of the caesium frequency, Δν Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s −1
Second - definition of second by The Free Dictionary Coming next after the first in order, place, rank, time, or quality 2 a Repeating an initial instance: a second chance b Reminiscent of one that is well known: a second George Washington; a second Waterloo c Alternate; other: every second year 3 Inferior to another; subordinate: second vice president at the bank; a leader second to none
Second - Simple English Wikipedia, the free encyclopedia 1 international second is equal to: There are 31,536,000 seconds in a common year, 31,622,400 seconds in a leap year, and 31,557,600 seconds in a Julian year Originally, the second was known as a "second minute", meaning the second minute (i e small) division of an hour
second - Wiktionary, the free dictionary From Middle English secunde, second, secound, secund, borrowed from Old French second, seond, from Latin secundus (“following, next in order”), from root of sequor (“I follow”), from Proto-Indo-European *sekʷ- (“to follow”) Doublet of secund and secundo
second - Simple English Wiktionary second is on the Basic English 850 List seat - second - secret: second is one of the 1000 most common headwords seat - second - secretary: English numbers ; 20: ← 1: 2: 3 → Cardinal: two Ordinal: second Frequency: twice Multiplier: double, twofold Distributive: doubly
Why is a second called a second? — Today You Should Know A "second" in time is called a "second" because it is the second division of an hour The first division of an hour is the minute, which divides an hour into 60 parts Seconds are the next division, breaking each minute down into 60 smaller units