Englishfor English speakers
indicator
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noun
(= index)
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
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noun
a signal for attracting attention
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noun
a device for showing the operating condition of some system
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noun
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
spring
Noun
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A spring is a twisted metal thing that can stretch and push.
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Spring is the part of the year before summer; the part of the year when it is getting warmer.
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A spring is a place where water comes up out of the ground.
spring
Verb
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If something springs, it jumps quickly and far.