-in

I.
a suffix used in adjectives of Greek or Latin origin meaning `relating to' and (in nouns thence derived) also imitated in English, as in coffin, cousin, lupin, etc.; and occurring unfelt in abstract nouns formed as nouns in Latin, as ruin.

{Middle English -in, -ine, from Old French, from Latin -inus, -ina, -inum, from Greek -inos, -inē, -inon}
II.
a noun suffix used in chemical and mineralogical nomenclature without any formal significance, though it is usually restricted to certain neutral compounds, glycerides, glucosides, and proteins as albumin, butyrin. In some compounds, as glycerine, the spelling -ine is also used, although an attempt is made to restrict -ine to basic compounds.

{New Latin -ina. See -ine2}
III.
the second part of a compound, indicating a communal session of the activity named, as sit-in, sleep-in, teach-in.

Australian English dictionary. 2014.

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