"studied display," 1540s, from French affectation (16c.) or directly from Latin affectationem (nominative affectatio) "a striving after, a claiming," noun of action from past participle stem of affectare "to strive for" (see affect (v.2)).
1. Lawson writes so well: in plain English, without fuss or affectation.
2. Her posh accent is pure affectation.
3. He made an affectation of indifference.
4. He speaks with a British accent, but that is just an affectation because he's not British.
5. I wore sunglasses all the time and people thought it was an affectation.