A catalyst is something that speeds up or causes a change without itself being changed. It is often used in science for chemicals, but also in everyday language for people or events that trigger big changes.
From 'catalysis', coined in the 19th century from Greek 'kata-' meaning 'down' or 'completely' and 'lysis' meaning 'loosening'. The idea was of a process that 'loosens' or breaks things apart to make reactions happen more easily.
In chemistry, a catalyst walks into the reaction, stirs everything up, and walks out unharmed—like the ultimate drama starter who leaves with perfect hair. When you call a person a 'catalyst', you’re borrowing a very precise scientific image for social change.
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