Affection = gentle lasting love like that of a parent for child.
- He has a deep affection for his old friends.
- She doesn’t show any affection for him.
- They showed a great amount of affection and gratitude for a small favour done by us.
- An affectionate hug/child.
Affectation = behaviour which is not one’s natural manner.
- She is sincere and quite without affectation.
- I wore sunglasses and people thought it was an affectation.
- The way she speaks reeks of affectation.
Affected = (adjective) pretended, not real, insincere.
- He spoke with an affected English accent.
- She had an affected smile on her face.
- He spoke in an affected manner.
Affect =(verb) influence, to cause some result or change in.
- Smoking affects health.
- The strike of mine-workers affected the price of coal.
- The government policy of the new taxation will affect the business community.