Qual é a diferença entre expectation e expectancy ?Podes indicar apenas respostas exemplo.

"Expectation" is used when there is a common agreement on what will happen (what is to be expected).

"Expectancy" is used usually about one's own expectations, and usually about something positive that will happen.

Expectation
"There is an expectation that you are not to be late to your job."
"He tends to go too far with his expectations of other people."

Expectancy
"She walked with a spring in her step, engrossed in the air of expectancy."
"Don't trail off too much with your expectancies. Stay grounded in reality."

Note: Expectancy is a less common word, and in most cases, expectation can and will be used. They are mostly interchangeable.