The meaning of SECOND is next to the first in place or time. How to use second in a sentence.

SECOND definition: 1. immediately after the first and before any others: 2. the position in which a person finishes a…. Learn more.

Define second. second synonyms, second pronunciation, second translation, English dictionary definition of second. n. 1. a. A unit of time equal to one sixtieth of a minute. b. The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations.

A second may be one-sixtieth of a minute or the item after first. If you ask whether you're second in line, the hostess might reply, "Give me a second and I'll tell you."

Second definition: A brief interval of time; a moment. Origin of Second Middle English seconde from Old French from Medieval Latin (pars minūta) secunda second (small part) feminine of Latin secundus second, following second 2 From American Heritage Dictionary of the English Language, 5th Edition From Old French second, from Latin secundus (“following, next in order" ), from root of sequor ...

Second The term "second" has a number of different meanings in the context of math and numbers. Possibly the most important is that it is the base unit of time in the International System of Units (SI). Other measurements of time, such as minutes, hours, days, weeks, and so on, are defined based on the second.