When you speak of 220VAC, what is the definition of VAC?

Actually, you now speak of 120 VAC and 240 VAC.

The term "AC" stands for "Voltage Alternating Current"

Homework? Since 220 was used, maybe not.

V is for Volts. AC means Alternating Current
220 V doesn't usually exist in the US anymore,it's 120/240.

It's not complete: 240 Vrms AC +-5%, 60 Hz
Frequency tolerences for the mains are quite good, but for appliance inputs you may see 50/60 Hz.

You also might see 90-285 VAC 50/60 Hz.

RMS stands for Root-Mean-Square. I'm not going to get into the Calculus, but AC meters can be True RMS meters or Average responding RMS reading and they are correct only for sine wave inputs.

A 120 V RMS signal has the same heating value as a 120 V DC signal when applied to the same resistive load.

Hey

I took a **** and you smelled it weenie