Samsara is usually translated “the cycle of rebirth,” but the word means “wandering” or “running together” — the ceaseless running of a mind that cannot stop grasping.
In Buddhist and Hindu cosmology, samsara names the literal rounds of rebirth that a being undergoes under Karma. In a more immediate sense, samsara is the texture of every moment spent reaching for satisfaction that cannot last. Nirvana and Moksha name the end of that running.