It means how fast something changes, and is obtained by dividing some quantity by a unit of time. Examples of rates:
Velocity is distance / time.
Acceleration is velocity / time.
Bandwidth is number of bits transferred / time.
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delicious scrunptious is slang meaning delightful or first-rate.
It has the same meaning as scientific notation for instance 123,000,000 is 1.23*108 when in standard form or scientific notation
deviation
it mean per rate
6.5 x 10^8