Collisionless has multiple meanings:
In information theory and computer science, collisionless refers to a types of computer networking architectures where packets of data cannot collide on the network as is possible in a protocol like ethernet, an example is token ring.
In cosmology and physics, collisionless refers to a medium in which the interaction cross-section between particles is so low that collisions between particles have no significant effect on the system. Examples include dark matter and low-density plasmas subjected to high magnetic fields.
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