/ ˌekspəˈzɪʃn; NAmE / noun ( formal )
1.
[ C , U ] a full explanation of a theory, plan, etc. :
a clear and detailed exposition of their legal position
2.
[ C ] an event at which people, businesses, etc. show and sell their goods; a trade fair
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WORD ORIGIN
Middle English : from Latin expositio(n-) , from the verb exponere expose, publish, explain.