Definitions

1. noun

A person, especially a young person, who is a pioneer or innovator in a particular field.

“He was a pion in the field of renewable energy and played a key role in its development.”

2. noun

A particle of a subatomic particle, especially a meson.

“The pion is a type of hadron that plays a crucial role in particle physics.”

3. noun

A small amount of something, especially a valuable or precious substance.

“The pion of gold from the mine was worth a fortune.”