What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?

In a Resistor-Capacitor (RC) circuit, applying a DC voltage causes the capacitor to charge over time. The rate at which it charges is determined by the circuit's resistance and capacitance, which are multiplied together to calculate the circuit's "time constant." By standard definition in electronics, one time constant is the exact duration required for an initially uncharged capacitor to reach approximately 63.2% of the applied supply voltage. It takes roughly five time constants for the capacitor to be considered fully charged (over 99%). The other options, such as "exponential rate of one" or "time factor of one," are distractors made up to sound like plausible engineering jargon. The universally recognized term for this 63.2% charging milestone is simply "one time constant."