decibels above 1 milliwatt

decibels above 1 milliwatt

[′des·ə·bəlz ə¦bəv ¦wən ′mil·i‚wät] (electricity) A measure of power equal to 10 times the common logarithm of the ratio of a given power to 0.001 watt; a negative value, such as -2.7 dBm, means decibels below 1 milliwatt. Abbreviated dBm.