There are 2 main definitions of -in in English:

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-in1

suffix

Chemistry

Origin

alteration of -ine4.

Definition of -in in:

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There are 2 main definitions of -in in English:

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-in2

combiningForm

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

Definition of -in in:

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