As nouns the difference between terms and psion
is that terms is while psion is the psi-meson, a sub-atomic particle.
terms
English
Noun
(head)
Statistics
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psion
English
Noun
(
en noun)
The psi-meson, a sub-atomic particle.
Someone psionic. i.e. Someone exhibiting conscious control of psychic, telepathic, or paranormal phenomena.
A character in a Role Playing Game (RPG) using psionics
.