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(occurring slowly over a long period of time)

Secular, as used in astronomy, indicates occurrence over a long period of time and not periodic. It is especially used to discuss the long-term trends in a motion that is periodic over the shorter term, such as stating that/how an orbit changes over time.

The term is commonly used in describing dynamics and orbits. Some phrases:

The term is also used in Time Series Analysis, with an analogous meaning.


Referenced by:
Gravitational Instability (GI)
Jacobi Integral
Laplace-Lagrange Secular Theory
Orbital Resonance
Perturbation Theory