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Decisecond is equal to 10-1 second (unit of time), comes from a combination of the metric prefix deci (d) with the second (s). Plural name is deciseconds.
Terasecond is equal to 1 000 000 000 000 second (unit of time), comes from a combination of the metric prefix tera (T) with the second (s). Plural name is teraseconds with symbol is Ts.