/ ˌæfekˈteɪʃn; NAmE / noun
[ C , U ] behaviour or an action that is not natural or sincere and that is often intended to impress other people :
His little affectations irritated her.
Kay has no affectation at all.
He raised his eyebrows with an affectation of surprise (= pretending to be surprised) .
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WORD ORIGIN
mid 16th cent.: from Latin affectatio(n-) , from the verb affectare aim at, frequentative of afficere work on, influence, from ad- at, to + facere do.