1.NounA dimensionless measure of the damping in second-order linear dynamic system, appearing as the term
ζ
{\displaystyle \zeta }
in the generalised equation of motion for such a system,
q
¨
+
2
ζ
ω
n
q
˙
+
ω
n
2
q
=
F
.
{\displaystyle {\ddot {q}}+2\zeta \omega _{n}{\dot {q}}+\omega _{n}^{2}q=F.}