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Discover LudwigThe phrase "time constant" is correct and usable in written English.
It is typically used in scientific and engineering contexts to describe a parameter that characterizes the response time of a system.
Example: "In control systems, the time constant determines how quickly the system responds to changes in input."
Alternatives: "response time" or "decay time".
Dictionary
time constant
noun
A characteristic of an exponential function, represented by τ in the function.
Exact(60)
and decay time constant tauoff.
and decay time constant tau2.
The time constant is evaluated.
The human time constant is very slow.
The synaptic conductance decays with a single time constant: tau_1.
The inset indicates the time constant τ of internalization.
Table 3 The calculated time constant by analyzing Fig. 6.
Note that a positive time constant corresponds to exponential decay, while a negative time constant corresponds to exponential growth.
The tuning parameter is IMC filter time constant.
The effective time constant for the process was calculated.
The time constant of the sensor is approximately 1 s.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com