Phase modulation (PM)

5-3-035

Angle modulation in which the instantaneous phase angle of a sine-wave carrier is caused to depart from the carrier angle by an amount proportional to the instantaneous amplitude of the modulating wave.

Reference: I.E.C.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

English

charge current

Intensity

Illuminance

Energy

Contrast

Celsius (previously Centigrade)

Capacitance

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM