. "One decade is a factor of 10 difference between two numbers (an order of magnitude difference) measured on a logarithmic scale. It is especially useful when referring to frequencies and when describing frequency response of electronic systems, such as audio amplifiers and filters. The factor-of-ten in a decade can be in either direction: so one decade up from 100 Hz is 1000 Hz, and one decade down is 10 Hz. The factor-of-ten is what is important, not the unit used, so \\(3.14 rad/s\\) is one decade down from \\(31.4 rad/s\\)."^^ . . . . . . . . . . "dec" . . . "Dec"@en . . . "http://en.wikipedia.org/wiki/Decade_(log_scale)"^^ .