There are 2 main definitions of -in in English:

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-in 1

Pronunciation:

suffix

Chemistry
Forming names of organic compounds, pharmaceutical products, proteins, etc. insulin penicillin dioxin

Origin

Alteration of -ine4.

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There are 2 main definitions of -in in English:

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-in 2

Pronunciation:

combiningForm

Denoting a gathering of people having a common purpose, typically as a form of protest: sit-in sleep-in love-in
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