Instantaneous frequency

5-3-285

Of an oscillation (not necessarily sinusoidal), the rate of change of phase, expressed in radians per second, divided by 2n.

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