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/ˈpaɪɒn/ · noun
(particle physics) Any of three semistable mesons, having positive, negative or neutral charge, composed of up and down quarks/antiquarks..
Use pion when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Pion means (particle physics) Any of three semistable mesons, having positive, negative or neutral charge, composed of up and down quarks/antiquarks..
Common synonyms include pi meson, pi-meson.
The opposite depends on the specific sense.
Use pion where its definition matches the intended context.
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