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The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).
Full Definition of SECOND. 1. f: being the forward gear or speed next higher than first in a motor vehicle. 2. : relating to or having a part typically subordinate to and lower in pitch than the first part in concerted or ensemble music.â second or secÂ·ondÂ·ly adverb. See second defined for English-language learners.ord Root of SECOND. The Latin word sequÄ«, meaning â to follow, â and its form secutus give us the roots sequ and sec. Words from the Latin sequÄ« have something to do with following. Something sec ond follows what came first.