## Time constant of an LRC circuit

I'm having trouble finding an equation for the time constant of an LRC circuit as a function of L, R and C. (In the same way that RC is time constant for an RC circuit) Does anyone know what the equation is?
Thanks!
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 Hmm maybe I'll not representing this right... Say I have an equation of the form A*exp(-a*x)*cos(b*x+c) for an LCR where A,a,b,c are parameters. Then 'a' corresonds to 1/(TimeConstant) but there should be a formula similar to 1/RC for an RC circuit to predict the value of that constant. I'm looking for the formula so that I can justify my guess of the parameter to fit it to my experimental data
 *bump* No help?

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