Englishfor English speakers
spark
Noun
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A non-matter created by rubbing two objects quickly. Used for starting fires with fuels.
This lighter does not work anymore. It does not produce any sparks.
spark
Verb
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Spark means to cause.
His strange attire sparked comment.
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