3. The prospect of the future; grounds upon which something excellent is expected to happen; prospect of anything good to come, especially. Of c or rank. His magnificent expiations made him, in the opinion of the world, the best much in Europe. (Prescott) By all men's eyes a youth of expectations. (Otway)
5. (Science: medicine) The leaving of the disease principally to the efforts of nature to effect a cure. Expectation of life, the mean or average duration of the life individuals after any specified age.