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Abbreviation. dB referenced to one milliwatt. (188) Note 1: dBm is used in communication work as a measure of absolute power values. Zero dBm equals one milliwatt. Note 2: In DOD practice, unweighted measurement is normally understood, applicable to a certain bandwidth, which must be stated or implied. Note 3: In European practice, psophometric weighting may be implied, as indicated by context; equivalent to dBm0p, which is preferred.